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Do not drain water from tank for atmospheric gas valve removal
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How
to replace Honeywell Gas control valve Do not drain water from tank for atmospheric gas valve removal |
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Reset gas
control to see if it will work: Rotate dial to OFF, wait 10 minutes for gas to clear. Then relight. This type gas control valve is powered by thermopile. Water heater does not have thermocouple. Thermopile is basically several thermocouples together. The thermopile produces enough current to power small circuit board inside gas control valve that monitors status and issues error codes. How to light water heater How to test gas control |
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warranty status Gas control valve and other parts are covered for full length of warranty period. Labor is covered first year of warranty. Model number and serial number are located on label on side of water heater. Serial number contains code for year of manufacturer. Find age of water heater Contact manufacturer. |
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Identify
gas control
numbers to buy replacement
Order gas valve replacement Located on side of gas control valve WV8840B1042 WV8840 This natural gas valve was taken from AO Smith water heater 2012 Buy natural gas Honeywell gas control at Amazon American / Honeywell gas control at Amazon Honeywell natural gas valve Reliance NG at Amazon Buy: Propane/ LP Reliance LP at Amazon Honeywell gas valve for propane |
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Turn gas OFF Rotate handle perpendicular across gas line. Do not drain water from tank |
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Remove gas line from
gas control valve 1) Do not let pipe ends get dirty. Remove old teflon tape, and keep debris out of pipe. Loose debris can travel into new gas control valve and cause malfunction. 2) Note how tight gas line is connected to gas control. Gas pipes are not overtightened into gas control valve. Use two wrenches to take apart union. Then disconnect from gas control. 3) Gas water heater with large BTU consumption: Use black pipe instead of yellow flexible gas line. Back of yellow flex package has BTU size chart. Water heater BTUs shows on label located on side of tank 4) Keep gas connections clean   |
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Move knob to OFF 1) Pull out plug with red and white wires located on front of gas control 2) Piezo Igniter wire comes apart 3) Unscrew manifold tube 4) Unscrew pilot tube 5) Notice how tight each thread is 6) Pilot tube: reverse thread for propane 7) Remove phillips head screw that holds front cover.
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 Larger image Temperature sensor, igniter and gas control can be replaced without draining tank. |
Do not
drain water from tank
on atmospheric type Loosen screw from front of gas control Take apart gas control valve Backplate remains installed. How to remove Honeywell gas control. 1) Remove 1 phillips head screw to left of pilot tube that holds cover (shown in image above). 3) Remove plastic gas control cover. Tip plastic cover out from bottom, and then pull straight back toward you and cover snaps off. Caution: plastic cover is connected to body with 3-strand yellow-orange-white wire. 4) Disconnect yellow-orange-white wire that connects to temperature sensor. Wire is plugged into circuit board on plastic cover. Grasp wire and pull upward to unplug wire from circuit board.. Part are not sold separately My experience shows that control board and thermostat can both go bad ... or one or the other goes bad. If you have an old Honeywell valve laying around that has same manifold pressure and rated for same type gas, try replacing either part... while this action may pose extreme hazard, and chosing safety over money is best course, some folks might want to experiment. |
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Honeywell gas control with front cover removed 2 clips hold valve body to backplate Backplate stays attached to water heater |
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Clip
holds Valve Body to Backplate 5) Remove valve body from backplate. Some models have 1 screw. Other models have 2 plastic clips that hold valve body to backplate. These are located at bottom on right and left side. Use screwdriver to push 1 clip down while while using another screwdriver to pry valve body outward. Then use screwdriver to push down other clip to release valve body. Replace valve body and other non-functioning parts |
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Replace
valve body and other non-functioning parts Then Reassemble gas control Push cover straight onto backplate. Snap two top pieces into backplate Put screw into bottom |
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Reconnect gas line
using yellow teflon Apply yellow teflon tape. Leave first two threads clean with no tape. Do not let dirt, stray teflon, or any debris enter gas line. Make sure gas line is clean. NO tape teflon on pilot tube or manifold tube |
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Reconnect
tubes and wires NO tape teflon on pilot tube or manifold tube Do not overtighten gas line to gas control valve, or it can damage valve Pilot tube and manifold tube are not overtightened |
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 Smell for gas leak Natural gas is lighter than air, and gas smell will rise Propane gas is heavier than air, and gas smell will fall to floor |
Turn Gas ON
Test for gas leak Apply soapy water to each gas connection a) Test gas line or flexible pipe: Mix liquid soap with water and use brush to put around around gas line joints to see if there are bubbles. Use plenty of soapy water. Wait: It will take time for bubbles to appear since gas is under low pressure. Soap bubbles coming from joint indicate leak: retighten pipes, use teflon tape on yellow flex pipe and black pipe. Do not overtighten pipes or damage can occur to gas control valve. b) Test factory-installed connections located below gas control valve Manifold and pilot tube connections located under the gas control valve do NOT use teflon tape. See image of manifold and pilot tubes If either tube under gas control valve is leaking, then tighten a little bit. Do not overtighten. Manifold and pilot tube: look for reverse thread on LP water heater. Regular thread on NG water heater Remember: Natural gas and propane gas both have less pressure on the line than water pipes, so gas pipes are easy to seal with ordinary wrench. If you can install water line without leaking, you can do the same with gas line. Do not over-tighten connections. |
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Light
water heater: Instructions printed on face f gas control to right of knob Rotate knob to OFF, wait 10 minutes for gas to clear. Rotate knob to Pilot Press in and hold knob in Pilot position Press piezo igniter button until pilot lights You should hear click sound, keep holding down knob Release knob when status LED blinks Larger image of instructions How to light water heater |
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Adjust temp All water heater temperatures are approximate Calibration of temperature should be within 10°-15° of temperatures shown on chart Use mixing valve when temperature setting is above 135° Risk of scalding when temperatures exceed 120° Typical bath-shower is 110° Buy from my affiliate links: Mixing valve kit at Amazon Water heater mixing valves at Amazon Resource: Advantages mixing valve |
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Add gas
water heater timer Automatically rotates temperature knob to reduce gas consumption Buy: Gas water heater timer at American Pacific Enter coupon code: GENO to save $5 Resource: Read about gas water heater timer |
 Larger image Mirror image of gas control valve electronics/ Image shows front and back of circuit board flipped in photoshop so front and back can be laid over top of the other. My experience shows that control board and thermostat can both go bad ... or one or the other goes bad. If you have an old Honeywell valve laying around that has same manifold pressure and rated for same type gas, try replacing either part... while this action may pose extreme hazard, and chosing safety over money is best course, some folks might want to experiment. My opinion is that Honeywell should sell the parts and add some lev3el of open source to the COM port so the American innovator can create mthe new and original that built our nation..... locking peoiple into payment plans and non-repairable appliances is unsustainable both for natural resources and recycling, to say nothing of our budgets. Corporations are of the opinion that people are made to feed them on demand, but reality will prove that model unsuccessful long-term. More pictures of Honeywell |
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Spec sheet showing model numbers, or differences between models is unavailable. The circuit board is probably customized by Honeywell for each application specified by water heater manufacturer. Circuit board is powered by current generated by heating thermistor. E1 and E2 in lower right corner connect to thermistor. Bradford White Service manual WV8840 communication port, or COM port The COM port or communications port is available to water heater manufacturer for connecting a 'future' product. In 2018, there is no method to utilize this port for DIY innovation. Bradford White uses the COM port to connect their 'setback controller' ... the design has gone through changes, and the application is unclear. Read about BW setback controller |
 Service manual (10Mb) Service manual 2 This gas control used for power vent models |
Honeywell
makes 2nd style gas control for power-vent, Low Nox, and some flue-damper models Reset gas valve: Slide on-off switch to OFF position. Go to blower system located on top of water heater and turn blower switch to OFF. Turn off all electric power to water heater appliance. Set Red knob to LOW. Wait 5 minutes to clear out gas. Check for the smell of gas that would indicate a leak. Turn on electric power to water heater Set blower to ON position. Slide on-off switch to ON position. Set Red knob thermostat to desired temperature. How to light power vent Honeywell gas valve Honeywell gas valve error codes Adjust temperature/ error codes on Rheem Honeywell How to light this type of gas valve: |
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Honeywell
gas control valve for Power vent models Troubleshoot resources at top of page ... is removed when replacing. How to replace gas valve thermostat Troubleshoot power vent water heater |
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Troubleshoot gas water heater/ all gas valves |
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