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
NOT S
SERVICE TTHE H
HEATER U
UNLESS YYOU H
HAVE
BEEN PPROPERLY TTRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital M
Multimeter - For measuring DC voltage when using
thermocouple diagnostic kit.
• Thermocouple D
Diagnostic K
Kit - (L. B. White Part No.
21188) When used with a standard digital multimeter,
this kit allows testing of the thermocouple and
electromagnetic power unit.
• Pressure G
Gauge - (L. B. White Part No. 20736) For
checking inlet pressures to the heaters.
INITIAL PREPARATION
-- Inspect heater for damage.
-- Clean heater as necessary.
Heater PProblems
Page
1. Inner Combustion Cone will not Light . . . . . . . . . . . . . . .21
2. Inner Combustion Cone Lights,
but will not Stay Lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3. Outer Combustion Cone Does Not Heat up on
High Thermostatic Head Setting . . . . . . . . . . . . . . . . . . .23
4. Heater Backflashes Gas Through Injector Body
Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5. Heater Does Not Return to
Low Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart. Refer to the servicing sections as necessary to obtain
information on disassembly and replacement procedures of
the component once the problem is identified by the flow
chart.
20
Troubleshooting Guide
WARNING
B
Buurrnn H
Haazzaarrdd
■
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.
