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Does pilot light go out when
button is released?
YES
Has the thermal switch
tripped?
YES
Check for insufficient
combustion air.
Are there openings
for make-up air to
NO
enter the room?
YES
Are the openings of sufficient size?
See Combustion Air Supply and Ventilation
section in this manual for requirements.
YES
Is there a furnace/air
handler in the same room as
NO
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
Is there proper drafting at the
draft hood? See Checking the
Draft section in this manual.
YES
Is the flame-arrestor free from
debris due to excessive lint, dirt,
dust or oil?
YES
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.
Is the igniter wire insulation burnt or
show signs of discoloration?
YES
PILOT LIGHT TROUBLESHOOTING FLOWCHART
Check Draft. (See Checking the
NO
Draft section of this manual.)
Are the wires from the gas
control valve/thermostat firmly
NO
connected to the switch?
YES
Are the wires damaged
and/or frayed?
YES
Replace the gas control
valve/thermostat.
Install correct size make-up air openings per
the Combustion Air Supply and Ventilation
section in this manual.
Correct size of openings to
NO
allow sufficient air.
NO
Check the vent system for restrictions/obstructions and check the vent
termination height. Refer to the Installation Instructions section of this
NO
manual for specific requirements.
Refer to the Use & Care Guide section of this manual for
NO
information on cleaning the flame-arrestor.
Is the pilot tube
NO
damaged?
YES
Shut-off the gas supply to the water
heater at the manual gas shut-off valve,
then contact Residential Technical
Assistance by referencing the phone
number on the front of the water heater.
Secure connections
NO
and attempt a relight.
Is the thermocouple
NO
connection loose?
YES
Tighten the connection
Does the thermocouple pass the test?
YES
Contact a local Heating, Ventilation, Air-
Conditioning & Refrigeration authorized
service provider.
Does the flame-
arrestor show signs
NO
of discoloration and/
or debris?
YES
31
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
NO
the pilot and watch the voltage readings on the
multimeter. After 45 seconds the meter should
read 12 millivolts DC or more.
NO
THERMAL
SWITCH
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Table of Contents
Troubleshooting
