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How to test water heater thermocouple |
| Test thermocouple/ pdf Test thermocouple and thermopile/ pdf Full service manual/ pdf How to replace thermocouple How to troubleshoot pilot light going out How to troubleshoot gas water heater |
Resources:Buy:Thermocouples at Amazon Thermocouple adapters  Buy Gas water heater thermostats at Amazon
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Mechanical gas control has thermocoupleResources:How to replace thermocouple Troubleshoot/ service manual/ by type of gas control How to replace gas control valve thermostat Buy: Thermocouples at Amazon Thermocouple adapters BuyGas water heater thermostats at Amazon |
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Electronic
gas control has thermopile Thermopile is several thermocouples together, so voltage produced by heat of pilot is large enough to power electonics inside gas control. Resource Test thermocouple and thermopile/ pdf How to replace gas control valve thermostat Buy Gas water heater thermostats at Amazon |
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Identify thermocouple: copper tube below gas controlIf gas water heater has standing pilot light, then copper tube will be connected to the gas valve.Thermocouple cannot have kinks, but copper can be rolled if thermocouple is too long. Thermocouple is finger-tight plus 1/4 turn. Overtigntening thermocouple will short electrical signal to gas control valve. Resources: How to replace thermocouple Resources for replacing thermocouple How to troubleshoot pilot light going out Buy Gas water heater thermostats at Amazon
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Thermocouple: Initial test1) Light pilot. Hold down pilot button for 30 to 60 seconds.2) Relase pilot button. 3) If pilot light goes out when button is released, then thermocouple is most likely at fault. If pilot light stays on without problems as long as gas valve is in PILOT position, but you then turn gas valve to ON position and main burner flutters and disappears within 30 seconds then 99% chance FVIR system is tripped Resource: Read about TRD/ FVIR |
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| With the pilot flame lit, turn OFF
the gas supply and
start to count seconds (one-one thousand, two-one thousand). Count for a full twenty (20) seconds. The pilot flame should be out. Listen carefully for a small clicking noise at the gas inlet side of the valve. If you count for the full twenty (20) seconds and do not hear a click then the thermocouple is fine. If you hear a click within the twenty (20) seconds then the thermocouple and/or gas valve are bad. Replace both the thermocouple and gas valve. |
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Remove thermocouple from gas valve using 7/16" wrench.Thermocouple is finger tight + 1/4 turnSome thermocouples are reverse threaded. Test thermocouple using multimeter:Thermocouple has 2 ends: one end screws into gas valve, other end is positioned in the pilot flame.1) Make sure thermocouple is positioned correctly in pilot flame. 2) Disconnect thermocouple from the gas valve thermostat using 7/16” wrench. 3) Using multimeter with alligator clip leads: Attach red lead to the body (copper part) of the thermocouple. Attach black lead to the end (silver part) of the thermocouple that connects to thermostat. 4) Follow instruction to light the pilot and watch voltage readings on multimeter. 5) If thermocouple is good, then after 45 seconds the meter should read 12 millivolts or more. 6) Clean end of thermocouple and clean inside gas valve connection before reattaching thermocouple. 7) Do magnet test below. A marginal thermocouple can still produce the millivolts – but only when it’s not under load. When it’s under load (connected to the valve and trying to operate it) it might not work. |
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 | MAGNET ASSEMBLY TESTING (Robertshaw Control)Step 1. Disconnect thermocouple fromcombination thermostat/gas valve.Step 2. Connect a thermocouple adaptor (Robertshaw P/N 75036) at the thermocouple location in the combination thermostat/gas valve. Step 3. Reconnect thermocouple to adaptor. Make certain all connections are tight (finger tight plus ¼” turn). Step 4 Using amultimeter capable of measuringmillivolts, connect one alligator clip to the set screw of the adaptor and the other alligator clip to copper portion of the thermocouple. Step 5. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minuets. Step 6. With ameter reading of 13 millivolts or greater, rotate knob of combination thermostat/gas valve to the “OFF” position. Step 7. The magnet should remain closed for a drop of at least 6 millivolts. You will here a “snap” or “click” sound when the magnet opens, if you hear this sound prior to a drop of 6 millivolts, the magnet is out of specification and the combination thermostat/gas valve should be replaced. | ||||
 Larger image | MAGNET ASSEMBLY TESTING (White Rodgers Control)Step 1. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes. If the pilot will not stay lit, hold the pilot button (located on the combination thermostat/gas valve) down during this test Step 2. Using amultimeter capable of measuringmillivolts, connect one lead using an alligator clip to the copper sheath of the thermocouple, use the second lead of themulti meter to probe the top terminal located at the back of the combination thermostat/gas valve. Step 6. With ameter reading of 13 millivolts or greater, rotate knob of combination thermostat/gas valve to the “OFF” position. Step 7. The magnet should remain closed for a drop of at least 6 millivolts. You will here a “snap” or “click” sound when the magnet opens, if you hear this sound prior to a drop of 6 millivolts, the magnet is out of specification and the combination thermostat/gas valve should be replaced. | ||||
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Typical multimeter will work/ might not have alligator clips.Without alligator clips you may need extra hand to keep pilot flame lit during test.Buy: Multimeters at Amazon  Buy non-contact voltage tester at Amazon Electric testers at Amazon Shop Amazon - Industrial and scientific  Shop
Amazon - Industrial Electric Products |
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General information about thermocouple1) CLEAR BLUE FLAME: Pilot Flame and Burner Flame must be clear blue color.Other colors such as orange and yellow indicate that burner parts, pilot orifice, and combustion chamber need to be cleaned. Troubleshoot by type of gas control 2) Water heater needs oxygen for combustion. If pilot is going out, then clean air intake and get more fresh air to water heater to see if problem is solved. 3) Thermocouple must sit in the pilot flame so it will stay hot. Heated thermocouple sends small electric current to gas control valve. If gas control is defective, or thermocouple is bad, or pilot blows out, or pilot flame is weak, or thermocouple has fallen loose, then gas control valve turns off pilot. 4) Re-install thermocouple: finger tight + 1/4 turn. If thermocouple is too tight, the insulator is crushed and the thermocouple shorts out against the gas valve. The gas valve cannot read the current and shuts gas off to pilot. More resources: Read step to replace themocouple Troubleshoot by type of gas control resources How to replace thermocouple/ Utube How to replace thermcouple 2/ Utube How to replace thermocouple pdf Burner is sometimes removed to replace thermocouple. In that event, go ahead and clean combustion parts and combustion chamber. If LP gas is used, then manifold tube has reverse threads. Be careful of reversed threads. When re-attaching burner tubes to gas control, use fingers to start the threads. Always check pilot and manifold tubes for gas leak using soapy water. Buy: Thermocouples at Amazon Thermocouple adapters |
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ECO
located inside thermostat probe on gas control
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Honeywell gas control: has thermopileGas control monitors Thermostat Temperature sensor. After setpoint temperature is satisfied, the gas control is shut down, and power removed from relay. The gas control LED flashes steady flash each 4 seconds to indicate proper operation..If flame is lost, the pilot and main valves are shut down. The gas control attempts to re-light the pilot 4 times. If unsuccessful, then power is removed from relay, and the gas control proceeds to a 5 minute lockout. The gas control re-attempts to light the pilot at next normal heating sequence. Pilot assembly is replaced on this type of gas valve. Resource Service manuals at Bradford White Service manual for the Honeywell Gas Control Valve Honeyell gas valve parts list/ pdf How to replace WV8840 Honeywell gas control valve Troubleshoot by type of gas control Buy: Honeywell gas control at Amazon Honeywell gas control at Amazon Buy Gas water heater thermostats at Amazon
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