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Troubleshooting Guide
READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT PROBLEMS.
Electrical Shock and Burn Hazard
■
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.
The troubleshooting flow charts on the following pages
provide systematic procedures for isolating equipment
problems. The charts are intended for use by a QUALIFIED
GAS HEATER SERVICE PERSON. DO NOT SERVICE THESE
HEATERS UNLESS YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital Multimeter - for measuring AC and DC voltage and
resistance.
• Microamp Diagnostic 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
ignition systems.
• Low Pressure Gauge - for checking inlet and outlet
pressures of the gas control valve against dataplate
rating.
INITIAL PREPARATION
■
Visually inspect equipment 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.
16
WARNING
Refer to the system operation sequence in this section to
gain an understanding as to how the equipment operates
during a call for heat. 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. Refer to the tables
below to identify what page to refer to when
troubleshooting any problems.
The L.E.D. will only be on when the selector switch is
positioned to "Heat" and the thermostat is set above room
temperature. The L.E.D. will not be on when the selector
switch is positioned to "Vent".
Heating Mode Problems
L.E.D. Diagnostic light not on during a call for heat . . .19
L.E.D. diagnostic light flashing:
A. Rapid Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
B. Long Flash (2 seconds on - 2 seconds off) . . . . .20
C. One Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
D. Two Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
E. Three Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
F. Four Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
G. Five Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
H. Six Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Ventilation Mode Problems
A. Motor Does Not Run . . . . . . . . . . . . . . . . . . . . . . .24
B. Motor "Hums", Does Not Run . . . . . . . . . . . . . . . .24
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
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