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Troubleshooting
Instructions
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
The troubleshooting flow charts in this section provide
systematic procedures for isolating heater problems. Refer
to the Component Testing section of this Service Guide for
general instructions on performing voltage and continuity
checks as well as evaluation of specific components as
indicated by these charts. Refer to the appropriate wiring
diagram for assistance in performing voltage and continuity
checks. Refer to the Service section for gas pressure checks
and adjustments as indicated by the flow charts.
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 voltage and resistance.
• Microamp D
Diagnostic K
Kit - (L. B. White Part No. 500-
08507) When used with a standard digital multimeter,
this kit allows testing of the flame sensor on direct sense
systems.
• Low PPressure G
Gauge - (L.B. White Part No. 550-00764) for
checking inlet and manifold pressures of the gas control
valve against dataplate rating.
INITIAL PREPARATION
■
Visually inspect heater for apparent damage.
■
Check all hoses for abrasion and wear. Replace any
that are suspect.
■
Make sure heater is properly installed and meets
minimum clearances to nearest combustible materials.
(Refer to dataplate on heater.)
■
Check all wiring for loose connections and worn
insulation.
IGNITION AND SAFETY CONTROL
Part 120-08117 and 120-09298
Refer to the system operation sequence in this section to
gain an understanding as to how the heater operates.
Understanding the operation sequence of the ignition
module and related components is essential as it will relate
directly to problem solving provided by the flow charts.
The ignition control module is self-diagnostic. The red light
on the module will flash a specific pattern depending upon
the problem which is diagnosed. To effectively use the flow
charts, you must first identify what the problem is by the
flashing pattern of the L.E.D. (light emitting diode) diagnostic
light. If the light is flashing, the flash pattern will be followed
by a pause and then a repeat of the flash pattern until the
problem is corrected.
The troubleshooting flow charts pertain to both part
numbers 120-08117 and 120-09298 ignition control
modules, unless indicated.
Module PPart N
No.
Problems
120-0
08117
120-0
09298
Page
L.E.D. Diagnostic
light not on
during a call
for heat
X
X
5.1-3
L.E.D. diagnostic
light flashing:
A. Rapid Flash
N/A
X
5.1-4
B. Long Flash
(2 seconds on -
2 seconds off)
N/A
X
5.1-4
C. One Time
X
X
5.1-4
D. Two Times
X
X
5.1-5
E. Three Times
X
X
5.1-6
F. Four Times
X
X
5.1-7
G. Five Times
N/A
X
5.1-7
H. Six Times
N/A
X
5.1-7
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.
August 1999
5.1-1
1
WARNING
Electrical S
Shock aand B
Burn H
Hazard
■
Do not attempt to service or repair this heater unless
you are a properly trained and qualified gas heater
service person.
■
Troubleshooting this system may require operating the
unit with line voltage present and gas on. Use extreme
caution when working on the heater.
■
Failure to follow this warning may result in property
damage, personal injury or death.
Troubleshooting Guide