PILOT LIGHT TROUBLESHOOTING FLOWCHART
Does pilot light go out when button is released?
YES
Has the thermal switch tripped?
YES
NO
NO
Check Draft. (See Checking the
Draft section of this manual.)
Are the wires from the gas |
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control valve/thermostat firmly |
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| and attempt a relight. |
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connected to the switch? |
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| Are the wires damaged |
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| Is the thermocouple |
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| NO |
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| and/or frayed? |
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| connection loose? |
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Tighten the connection
Test the thermocouple using the following procedure: Disconnect the thermocouple from the gas control valve/thermostat. Using a multimeter with alligator clip leads, attach the red lead to the body (copper part) of the thermocouple. Attach the black lead to the end (silver part) of the thermocouple that connects to the gas control valve/ thermostat. Follow the instruction to light the pilot and watch the voltage readings on the multimeter. After 45 seconds the meter should read 12 millivolts DC or more.
Check for insufficient combustion air.
Replace the gas control valve/thermostat.
YES
Does the thermocouple pass the test? 
NO
Replace the thermocouple.
Are there openings for
YES
NO
Install correct size
Are the openings of sufficient size?
See Combustion Air Supply and Ventilation section in this manual for requirements.
YES
NO
Correct size of openings to allow sufficient air.
NO
Is there a furnace/air handler in the same room as the water heater?
YES
Does the return air duct for the furnace/air handler draw its air from a separate location than the water heater? See the Location Requirements section and the Combustion Air Supply section.
YES
NO
Contact a local Heating, Ventilation, Air- Conditioning & Refrigeration authorized service provider.
Is there proper drafting at the |
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drafthood? See Checking the |
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Draft section in this manual. |
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Is the |
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debris due to excessive lint, |
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dirt, dust or oil? |
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| YES |
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Check the vent system for restrictions/obstructions and check the vent termination height. Refer to the Installation Instructions section of this manual for specific requirements.
Refer to the Use & Care Guide section of this manual for information on cleaning the
WARNING | |
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| N |
Check the water heater for a Flammable Vapor (FV) event. Note: it may be necessary to remove the manifold door assembly to visually inspect the water heater. Reference the Maintenance of your Water Heater section of this manual for removal instructions.
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| Does the flame- | |||
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| Is the pilot tube |
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Is the igniter wire insulation burnt or |
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| NO |
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| damaged? |
| NO |
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show signs of discoloration? |
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| of discoloration | ||||||||||||
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| YES |
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| and/or debris? | |||||
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| YES |
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YES
N |
Thermal |
Switch |
26
