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Troubleshooting Guide
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
The following troubleshooting flow charts provide systematic
procedures for isolating heater problems. The charts are
intended for use by a QUALIFIED GAS HEATER SERVICE
PERSON. DO N N OT S S ERVICE T T HE H H EATER U U NLESS Y Y OU H H AVE
BEEN P P ROPERLY T T RAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital M M ultimeter - For measuring DC voltage when using
thermocouple diagnostic kit.
• Thermocouple D D iagnostic K K it - (Part # 21188) When used
with a standard digital multimeter, this kit allows testing of
the thermocouple and electromagnetic power unit.
• Pressure G G auge - (Part # 20736) For checking inlet
pressures to the heaters.
INITIAL PREPARATION
-- Inspect heater for damage.
-- Clean heater as necessary.
15
■
Troubleshooting this system may require operating the
heater with the burner on. Use extreme caution when
working on the heater.
■
Failure to follow this warning will result in burns
causing severe injury.
Heater P P roblems
1. Inner Combustion Cone will not Light . . . . . . . . . . . . . . .16
2. Inner Combustion Cone Lights,
but will not Stay Lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3. Outer Combustion Cone Does Not Heat up on
High Thermostatic Head Setting . . . . . . . . . . . . . . . . . . .18
4. Heater Backflashes Gas Through Injector Body
Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
WARNING
B B u u r r n n H H a a z z a a r r d d
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