Search
Search using google with ads
This page shows basic parts found on residential gas water heaters and describes general operation of heater.
E-mail: geno03245w@gmail.com
Back to 14 things needed for gas water heater
Tech support options
|
Search Search using google with ads |
Basic parts and operation of gas
water heater This page shows basic parts found on residential gas water heaters and describes general operation of heater. E-mail: geno03245w@gmail.com Back to 14 things needed for gas water heater Tech support options |
 Larger image Larger image Basic parts Figs 1-2 show parts found on atmospheric vented heaters where natural updraft of air pulls fresh air into combustion chamber from surrounding room while toxic combustion by-product goes up flue pipe into atmosphere. The flue baffle helps hold heat inside tank, adding heat to water without restricting upward flow of poisonous byproduct. Parts not shown: Electronic gas control valve, FVIR or flammable vapor protection, FV or gasoline vapor sensor, thermocouple, thermopile, manifold assembly including burner and pilot assembly etc. Parts that are installed on other types residential heaters but not shown include: power vent blower, flue damper motor, helical heat exchanger, pressure switch, condensate drain, etc. Types of gas water heaters Resources TP valve code Repair water heater valves How much does it cost to run gas water heater Energy factor or Unified Energy Factor (EF or EUF) for residential heaters is a vague number posted by manufacturers that might help with tank comparisons, but is actually a near incomprehensible testing procedure from the DOE that subtracts a percentage of tank volume to calculate actual efficiency, with smaller tanks having less surface area, and less heat loss, so slightly higher efficiency than larger tanks. Typically a manufacturer will happily report .67 EUF for gas water heaters, but actual efficiency is always less. 40 gallon tank with EUF .67 will have: 61.5% efficiency 50 gallon tank with EUF .67 will have: 60% efficiency This means, 38-40% of heat goes up vent pipe into atmosphere, and no amount of jangling numbers or adding dampers etc can favorably change the laws of physics. In addition to heat, the combustion by-product includes CO NOx SO CO2 and acidic water. CO: Carbon monoxide/ NOx: Nitrogen oxides: nitric oxide and nitrogen dioxide/ SO: Sulfur oxide/ CO2: Carbon dioxide ... each by-product is an environmental poison that must be vented from house to prevent death of occupants. |
 The
gas valve controls water
heater
operationGas water heaters have a control valve that connects to household gas line, then releases gas to the pilot light and to the burner. Each type of gas valve comes with safety features that shut off gas in event of overheated combustion chamber, overheated water inside tank, no pilot flame, gas valve failure, or other failure. Gas valves have a thermostat probe that is immersed in water at back of gas valve. The probe contains a variable resistor or thermistor that estimates water temperature. The gas valve responds to water temperature and to user's choice of temperature setting to determine when to turn burner on and off. When the pilot light and gas valve are functioning, then the gas valve receives input from the thermostat. When water temperature drops, the gas valve releases gas down the manifold tube to the burner located inside combustion chamber. The gas enters the burner from below where it passes through an orifice that controls the amount of gas that enters the burner. The orifice size is different depending on BTU output of heater etc. The burner is made of different metals depending on type of gas, with propane requiring cast iron because of higher temperatures than natural gas. The pilot light is aligned with a jet or opening on the burner so the gas is ignited and heating begins. When water temperature reaches set point, the gas valve turns off gas to burner, but the pilot light remains on at all times and is not turned on and off. Exception would include some power vented heaters with a hot surface igniter instead of a standing pilot light. Water temperature around the thermostat probe can drop 15-25° before main burner is activated. Calibration on gas valve is approximate by 5-8°F. If calibration is far off, then rotate dial so temp at faucet is good. If thermostat is out of calibration, and on-off temps do not match the temperature setting, or the water heater lets temperature drop too low before activating the burner, then there are no adjustments and gas valve should be replaced. If temperatures fluctuate, then plumbing is first suspect. Check temperature of water at TP valve and at water heater drain valve. Check for stacking or crossover Gas valves are different based on type of gas, propane or natural gas, and different by design of heater, manufacturer specs, BTU rating of burner etc. So a heater with 30,000 BTU burner might have different gas valve than heater with 50,000 BTU burner, even though both valves might appear same .. or the gas valves might be same, and only the orifice on burner is different. Check model number located on side of gas valve. Troubleshoot etc Troubleshoot gas control valve thermostat How to replace water heater gas valve How to light gas water heater |
 Larger imageAnother image Mechanical gas valves White Rodgers and Robert Shaw Mechanical control valve thermostats are powered by a thermocouple that screws into bottom of gas valve and terminates inside combustion chamber just above or next to the pilot flame. Once the pilot light is lit using piezo igniter, the pilot flame heats the thermocouple which produces a small current, not enough current to power a circuit board, but enough to operate the mechanical gas valve. The current travels up an insulated wire inside the copper tube of the thermocouple where it makes electrical contact with the gas control valve. The current powers a small electromagnet called the safety magnet, so if thermocouple fails, or pilot light goes out, the electromagnet clicks off with a barely audible click and shuts off all gas to heater, so neither the pilot light or burner can receive gas.  The
thermostat on mechanical valves is generally a thermistor
located inside the thermostat probe on back of gas valve.
When water temperature drops below thermostat set point, the
gas valve releases gas down the manifold tube to burner, where the
pilot light ignites gas.The copper thermostat probe also contains an ECO energy cut off, which is a single-use high limit thermal switch that trips when water temperature inside tank exceeds 180°F. The thermistor and ECO are connected in series to two red wires that travel down to the TCO (thermal cut off) located on front of combustion chamber. These wires are also in series with the gas valve, so as long as the single use ECO is not tripped, and TCO thermal switch on front of combustion chamber are not tripped, then the gas valve receives input from the thermistor, and sends gas down the manifold tube to the burner when heat is called for. By design, the resettable TCO should trip if combustion chamber reaches 180°F, which means the single-use ECO should never trip because water should not reach 180°F inside tank if the burner stops heating at 180°F. |
 Larger imageHoneywell WT series electronic gas valves for atmospheric heaters. This type gas valve uses a thermopile located inside combustion chamber to produce electrical current and does not have a thermocouple like mechanical gas valves. Photo shows igniter switch that ignites the pilot light located next to outer edge of burner inside combustion chamber. The pilot tube supplies gas to the pilot flame, and the pilot burns continuously unless the gas valve senses problem and shuts off gas. Once the pilot flame is lit by following instructions printed on front of gas valve, the heat from the pilot flame heats the thermopile which generates a current that travels through the red and white wires that plug into front of gas valve. The current powers the circuit board located inside gas valve. The circuit board controls gas valve operation. The gas valve uses temperature inputs from variable resistor located inside the thermostat probe, plus user's temperature setting to determine when to release gas to the burner via the manifold tube. Once gas reaches the burner, it passes through the orifice into the burner and comes out ports that are located around outer edge of burner where it is ignited by the pilot light.  The red wire and white wires from thermopile pass through a TCO (thermal cut off switch) located on front of combustion chamber. The TCO trips if combustion chamber exceeds temperature limit. If TCO trips, it cuts off current from thermopile so gas valve circuit board shuts off gas to both pilot and burner. The TCO on regular atmospheric heater is a resettable part located on front of combustion chamber. On Ultra low NOx heaters, the TCO or thermal switch is sometimes located inside the combustion chamber, and generally must be replaced if it trips. The thermostat probe is a metal-tipped plastic tube that protrudes from back of gas valve into the water and contains the variable resistor that connects to the circuit board via 3 wires. The ECO (energy cut off) or high limit is part of the circuit board. If the variable resistor senses water inside tank exceeds 180°F, the circuit board will cut off gas to heater, shutting down both pilot and burner, and issues error code as series of blinks. |
 Honeywell WV series electronic gas valves. All water heater gas valves control the gas supply and operation of the heater, but this style gas valve is generally used for water heaters that plug into 120 volt outlet, and have a blower or damper assist. Electronic gas controls that are used on power vent, power direct vent and flue dampered heaters are powered by 120 volt or by 24 volt AC from a transformer. They do no have a thermocouple or thermistor, and typically do not have a standing pilot light. They use a hot surface igniter or in some flue damper models, the gas valve has a sequence that lights the pilot flame just before gas is released to burner so that the pilot flame only burns when the heater is heating water. If a hot surface igniter is used, then the gas valve turns on the igniter just before gas is released to burner, then the igniter glows red hot to sustain ignition of gas until shortly after gas to burner is turned off. The operation sequence of the WV series varies by brand and type of heater, but the basic thermostat, operation and safety features are same as Honeywell WT series described above. An additional layer of operation and safety includes electrical inputs from the igniter, a pressure switch, the blower circuit or damper circuit etc, and include timed sequence for blower to turn on before gas is released to burner, and to continue running after burner is off so the vent pipe is purged of combustion by-product, etc.  Resources Review flue damper heater Troubleshoot power vented heaters Buy Example Honeywell gas control valve Reliance NG at Amazon |
 White Rodgers Intellivent Electronic gas controls that are typically used on power direct vent heaters are powered by 120 volt and do not need a thermocouple or thermistor to power gas valve circuit board. The thermostat probe contains a variable resistor the gives water temperature input. A hot surface igniter is used instead of standing pilot light. The gas valve turns on the igniter just before gas is released to burner, then the igniter glows red hot to sustain ignition of gas until shortly after gas to burner is turned off. The operation sequence includes input from blower motor and pressure switches, plus timed sequences for blower to turn on before gas is released to burner, and to continue running after burner is off so the vent pipe is purged of combustion by-product.  The basic thermostat and safety features are generally same as Honeywell WT series described above. Buy Buy Intellivent gas control White Rodgers/ Rheem Intellivent gas control AO Smith intellivent AO Smith Intellivent at Amazon AO Smith White Rodgers |
 Inside
Honeywell WT series gas controlHoneywell electronic gas control used for atmospheric vented heaters receive power from thermopile that supplies electric current to a circuit board (see images). The circuit board has 3 connection points that supply power to electromagnets. The main gas supply magnet shuts off gas to pilot and burner if TCO trips or if pilot light goes out, or if water heater is turned off. The manifold magnet responds to temperature measurements and turns gas on to main burner during the call for heat. Mechanical gas control valves also have electromagnet that receives current from thermocouple (see image), but there is no circuit board. The gas supply must be kept dry and clean or the gas control can clog and fail. When working on water heaters, installing and repairing, care must be taken to keep gas lines clean. Any debris or moisture entering gas valve can cause failure, requiring replacement of gas valve. |
 Thermal cutoff (TCO)
is a resettable thermal switch located
on the front of combustion chamber door.The TCO is integral with gas valve operation, depending on type of gas control valve. When temperature inside combustion chamber exceeds thermal rating, the TCO will turn off gas valve, which shuts off gas to pilot and burner. Temperature cutoff points for TCO range from 160°C to 200°C depending on model. The pilot can be relit after the TCO cools down below 120° F. The TCO has 2 functions: 1) Respond to flammable vapor ignition and 2) Respond to high temperatures caused by inadequate air supply etc. Causes of tripped TCO are dirty combustion parts, clogged vent... these things cause overheated combustion chamber. Solution: Push in button to reset, replace TCO, clean burner parts (how to clean burner), check vent is drafting air (check the draft), get more air to unit (troubleshoot air supply). Is the thermal switch bad? For example TCO trips when combustion chamber is not hot. Test the TCO thermal switch. Temporarily jumper a wire across the two terminals and see if water heater functions. Buy: Thermal reset |
 Temperature sensor instead of TCOFig-6 shows water heater with temperature sensor instead of resettable TCO. The sensor has 2 wires that connect to the gas valve in a port marked 'sensor wires' in the image. The resistance value 5.39 to 5.9 ohms. Fig-7 larger image shows location of sensor on front of lo NOx burner. The Low NOx manifold assembly reduces NOx by 33%. Some states mandate reduction of NOx, nitrogen oxide, a poison that is released into atmosphere by burning gas at higher temperatures. Other states embrace an environment devoid of life. Typical gas water heater without the low NOx burner simply mixes air and fuel vapor. Ignition 'almost always has some zones operating at or above peak NOx formation.' Low NOx burner keeps flames from reaching the NOx formation temperatures. FYI ... Heating water using solar energy does not require burning gas at the home or business location, although burning fuel is most likely needed to manufacture, transport and install solar heater. Explanation of error codes  |
|
 Thermopile Fig-8 shows water heater model with thermopile, indicating it is made for Honeywell WT series electronic gas valve. Models with mechanical gas valve have thermocouple which can be identified by the copper tube going into combustion chamber, whereas the thermopile is identified by 2 wires entering the combustion chamber. If heater has electronic gas valve, the TCO turns off current produced by the thermopile that sits inside the pilot flame, same as thermocouple. Heat from the pilot causes current to flow on wires to gas control. The wires are also connected to the TCO. If the TCO trips, the gas valve is no longer receiving current and will shut down and turn off gas to burner. natural or LP gas manifolds: 1/2” OD carbon steel tubing with .026” wall thickness |
|
 ThermopileImage on left shows burner assembly, or manifold assembly used with Honeywell WT series electronic gas valves. It shows the fixed-positioned bracket that holds pilot, thermopile and igniter.  The
piezo igniter creates spark that ignites pilot light. The pilot flame
burns clear blue when water heater is receiving adequate gas pressure
and air supply. The pilot light performs three jobs: 1) Heat the
thermocouple or thermopile that creates small electric current that
powers operation of gas control that also
2) signals gas
control valve that pilot is lit, and 3) ignites the gas when it is
released down the manifold tube, through the orifice, into the burner
where it comes out of ports located on side of the burner.A thermopile is basically several thermocouples put together. The thermopile produces more current than thermocouple. Thermopile produces enough current to power circuit board inside the electronic gas valves so it can compile operation status, issue error codes via LED status light, and control operation of heater. With the electronic gas control valve, the pilot flame heats a thermopile instead of thermocouple. The thermopile works on same principle as thermocouple, except is larger and creates more current than thermocouple, enough current to power a circuit board inside the gas control valve. Unlike thermocouple, the current from thermopile travels to gas control valve through two wires that connect to front of gas control. The circuit board controls a series of self-check routines, error compilations of water heater operation, etc and uses electromagnets to control flow of gas that enters the gas control, and gas going to pilot and burner. See basic gas water heater parts If no current is produced by thermocouple or thermopile, then gas to the valve is shut off until pilot is re-lit or defective thermocouple or thermopile replaced. The temperature-reading thermostat on a gas valve is located inside a copper tube that protrudes into tank and reads water temperature. When water temperature drops below selected thermostat setting, then the gas valve releases gas through the manifold tube and into the burner located in combustion chamber. How to adjust temperature Gas flows out of the burner where pilot light ignites gas. If burner is dirty, sooted or obstructed, the gas may not light immediately, resulting in unburned gas building up until it reaches the pilot flame causing explosion hazard. Sooted and dirty burner and yellow flame indicate this problem. After cleaning the burner and the combustion chamber, the gas should burn blue with bits of red and yellow. Clean burner |
|
 ThermocoupleUsed mechanical valves, the pilot flame heats the end of a thermocouple. A thermocouple is 2 dissimilar  metals
joined together that produce small current when
heated. The small electric current travels from the thermocouple
though a wire inside the hollow copper tube. The thermocouple tube
screws into to bottom of the control valve, finger-tight plus 1/4 turn, where it
connects to an electromagnet. If the pilot light is ON and thermocouple is sitting in the pilot flame, and the thermocouple is working and making electrical connection to the gas control, then the electromagnet is energized. The electromagnet holds open the safety valve as long as the pilot flame is heating the thermocouple. If the pilot light is out, then the electromagnet closes the safety valve, and no gas can enter gas control. When pilot is re-lit, the magnet makes barely audible click that can be detected when troubleshooting.  If the pilot flame is extinguished, it can take up to 180 seconds for the thermocouple to cool sufficiently for the electromagnet to de-energize and close the safety valve. The safety valve determines if gas can flow into gas control. If safety valve is open, then gas control operates normally, and releases gas continually to the pilot light through the pilot gas regulator valve, and releases gas to burner through the main regulator valve when thermostat probe detects water temperature is below set point as selected on dial located on front of gas control. |
|
 FV sensor
mounted on outside of
gas water heater is first layer of protection:The FV sensor flammable vapor sensor is different than FVIR system flammable vapor ignition system. FVIR systems vary by
manufacturer or brand.
The FV sensor is located on front of some water heaters near the
bottom. The sensor will trip if it senses gasoline vapors in
the air. It
does not respond to other types of flammable vapors. FV sensor is generally same across all brands. FVIR system is located inside the water heater and responds to all sources of flammable vapor ignition, and in some models, responds to overheating events caused by miscalibrated thermostat or failed TCO etc. The FV sensor will trip if it senses gasoline vapors in the air. It does not respond to other types of flammable vapors. Research shows that gasoline is the most common cause of fire or explosion caused by water heater. Note: FV Sensor does not prevent the ignition of flammable vapors, the FVIR System is designed to reduce the risk of flammable vapor-related fires.  FV sensor is installed inside a plastic case to keep
it
dry and clean...
if the sensor is blocked, or has been covered with dust, leaves, water
etc, it will not function. The sensor must have continuity, so a small current of electricity can pass through the sensor that signals to gas control valve that no gasoline vapor is detected. The FV sensor is easily tested using multimeter and easily replaced by plugging new one into terminal slots.  Buy:Flammable sensor kit Multimeters at Amazon Electric testers at Amazon Resource: How FV sensor works How to test FV sensor |
| How gas water heaters work |
 Larger imageHow atmospheric vent water heater works This type heater vents straight up through the roof and requires no electric outlet for operation. Note the image on right shows mechanical gas control valve, copper tube for thermocouple, and the TCO that connects to gas valve and is integral with the thermocouple, cutting off electrical current from thermocouple so the gas entering gas valve is shut off, but TCO wires don't enter combustion chamber. This model does not have thermopile. Mechanical gas control valves use thermocouple that can be identified by copper tube connecting to bottom of gas control valve. It's also important to note that each model water heater must have a gas control valve that matches the design of the heater. So an electronic gas control cannot be retrofit to replace mechanical gas control. Sequence of operation -The gas valve controls on-off operation. It senses that water inside tank is below set point. -If the pilot light is ON, the pilot flame heats the thermocouple or thermopile. The thermocouple or thermopile creates a small current that travels to gas control valve. -If the small current arrives at the gas control, and the control is functioning, then gas is released to the burner. -If the pilot flame is positioned correctly in front of burner, at the correct distance, and gas pressure is good, and burner is in good shape, then the pilot light ignites the fuel. -When temperature of water inside tank reaches the high set point, for example 120°F, the gas control valve thermostat turns off gas supply to burner. The water heater goes into standby mode until water temperature drops below thermostat set point again. -If a problem occurs and temperature of water inside tank exceeds the 180°F high limit, then ECO trips and gas control valve turns off all gas. -Gas control valve may require replacement to correct cause of overheating. -If the thermostat comes out of calibration, and is no longer reading correct temperature, it requires replacement of gas control valve. Resources: How to troubleshoot gas control valve How to troubleshoot thermocouple and thermopile |
 How
power vent water heater worksPower vent heaters generally use a hot surface igniter instead of pilot light, depending on model. Two types of power vent water heaters Power vent water heater (pictured below) has one vent pipe connected to water heater, and derives all incoming air from inside the home and releases combustion gas via a sealed vent installed either horizontally through a side wall, or vertically through roof. Power direct vent has two pipes connected to water heater, one for intake and one for vent. Power direct vent derives all incoming air from outside the home through a sealed intake pipe and is vented through roof or side wall, and outside air supply can come from roof or side wall. Both types power vent heaters require 120 volt electric outlet for operation. Improper grounding or reverse hot-neutral polarity can cause ignition failure and/or short cycling (repeat on-off attempts).  Unlike
atmospheric heaters that passively vent combustion by-product through a
3 or 4" galvanized pipe, the power vent applies pressure via a blower
motor. As a result, power vented heaters must have a sealed vent that
is glued so no toxic byproduct can enter building.Operation sequence: -The thermostat senses water inside tank is below set point and closes a circuit that turns on the 120 volt blower located on top of water heater. -The blower pulls air upward through the combustion chamber and into the vent pipe, releasing toxic combustion by-products, including NOx SO CO CO2 and acidic water vapor, into the atmosphere, where it creates an exciting new future for the planet, rendering the product obsolete at some point. Alternative for some: Connect solar panels directly to electric water heater -At the blower, the vacuum safety switch is connected to blower via rubber tube. The rush of air through the vent pipe creates vacuum pressure. -The vacuum or pressure switch measures the vacuum created by the blower and verifies the blower is operating at speed. This ensures the blower can evacuate combustion gasses and support complete burning of fuel. Complete burning prevents explosion hazard caused by ignitable fuel gathering inside combustion chamber or vent pipe. The efficiency of gas water heater combustion is typically 60-61%, with the remaining 39-40% of heat going up the flue pipe. Calculate efficiency -Once the blower operation and flow of air is confirmed by the vacuum switch, it closes (turns on) a small circuit that signals the gas valve thermostat that the blower is working. -If the 120 volt outlet has correct voltage, polarity and grounding, the gas valve electronic control board activates the hot surface igniter, if the igniter is not burned out or needing to be cleaned, and it tests between 15-18 ohms at room temperature, the igniter glows red with heat as gas is released down the burner tube, through the orifice into the burner head. -If the gas pressure good, and the orifice is clean and correctly sized, and hot surface igniter and burner head are clean and in good working order, and the igniter is correct distance away so the gas comes into contact with igniter, and igniter is positioned correctly in front of a gas jet, the gas will ignite and burn blue. Flame sensor confirms that flame is present and signals the gas valve to continue releasing gas. The igniter remains hot to continually ignite the flow of gas. Water temperature inside tank begins to heat as poison by-product goes up vent pipe. -If the water heater has pilot light instead of hot surface igniter, the burner assembly has a pilot tube instead of igniter wires that connects to gas control valve. The control valve releases gas into the pilot tube continually as long as thermopile is functioning and correctly positioned in the pilot flame so it sends small electric current to gas control valve, signaling that pilot flame is working. If the pilot flame and thermopile system are working, the ignition sequence is ok to release gas once the blower operation is confirmed. -If the blower is not operating, or running at lower speed because of a brownout or lack of voltage, malfunction or improper venting, the vacuum switch does not receive enough vacuum pressure and will not close, and the ignition sequence will not take place. -The blower has a resettable thermal safety switch that monitors vent temperatures. If temperature on vent pipe at the blower exceeds 180°, the thermal switch opens (shuts off) the circuit between gas control valve and pressure switch. The vacuum switch resets to open position and gas valve thermostat turns off gas supply until vent pipe cools, after which the heat cycle begins again. With modern electronic gas control valves, repeated failures in the ignition and heating sequence are recorded by the gas control valve. When errors exceed parameter, the gas control valve issues error code. -If temperature of water inside tank exceeds high limit set point of thermostat, then gas control valve turns off all gas. Older style gas control valve may require replacement. Newer gas control valves can be reset (with exceptions) once repairs have been made to correct cause of overheating. If the thermostat comes out of calibration, and is no longer performing, it requires replacement of gas control valve. -When temperature inside tank reaches the set point, for example 120°F, the gas control valve thermostat turns off gas to burner, but the blower keeps running for a set period of time to purge all gas from vent pipe, then the blower turns off. The water heater goes into standby mode until water temperature drops below thermostat set point again. Resources: Intellivent wiring How to troubleshoot gas water heater Troubleshoot power vent water heater Troubleshoot power vent gas valves |
 TP valve 2 in 1 protection against excessive pressure and excessive temperature Resources TP valve code Troubleshoot and replace TP Troubleshoot water heater valves |
 Anode rod Prevent rusted tank, prolong life of water heater Resources How to replace anode rod How to maintain water heater |
| 14 things needed for gas water heater & .pdf resources | |
 |
What you need for
operation of gas water heater. Troubleshoot gas water heater 1) Basic parts and operation 2) Adequate incoming air supply ... issues: closed doors, tightly insulated house, very hot attic. 3) Adequate air supply getting to burner... issues: dirty vent screen, dirty environment, maintenance. 4) Thermal cutoff ... TCO ... issues: failed part, maintenance, vent. 5) Flammable vapor lockout .... issues: exposure to vapors, bad FV sensor, failed FV system, 6) Fuel supply to gas valve thermostat ... natural gas and propane are different ... issues: wrong gas, low pressure, moisture in pipe, undersized gas meter, supply line too small for BTU rating. 7) Gas valve thermostat regulates fuel supply ... issues: not enough gas, failed thermostat, failed gas control valve. 8) Fuel supply from thermostat to burner ... issues: maintenance, thermocouple-thermopile, gas control valve. 9) Clean and replace burner ... issue: periodic maintenance requires burner inspection, cleaning, and possible replacement 10) Functioning thermopile-thermocouple-pilot light ... issues: misalignment, failure of part. 11) Ignition of fuel supply by pilot light or hot surface igniter ... issues: pilot light, piezo igniter, electrode. 12) Power vent water heater troubleshoot ... issues: pressure switch, blower, blower sequence from gas control, outlet polarity 13) Venting combustion byproduct .... issues: vent in disrepair, other vents in house drawing air 14) Misc troubleshoot manuals |
 |
 |
Buy
from my affiliate links every time/ thanks: Amazon ''As an Amazon Associate I earn from qualifying purchases'' Enter Amazon from any link on my site, fill cart with any item ... purchases pay small commission E-mail: geno03245w@gmail.com My response might end up in spam folder, check email folders Waterheatertimer on Twitter Message thru facebook |
