Troubleshooting Guide - L.B. White Guardian Series Owner's Manual And Instructions

Troubleshooting Guide

READ THIS ENTIRE SECTION
BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.
WARNING
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 fl ow 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.
• Low Pressure Gauge - (Part No. 00764)
for checking inlet and outlet pressures of the
gas control valve against dataplate rating.
INITIAL PREPARATION
■ Visually inspect equipment for apparent
damage.
■ Check all wiring for loose connections and
worn insulation.
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 fl ow charts.
Guardian with Smart Sense™
The ignition control module is self-diagnostic. A solid on
red light indicates normal operation.The red light on the
module will fl ash a specifi c pattern if a heater problem
is identifi ed, depending upon the problem which is
diagnosed.
Hot Surface Igntion Problems
Heater not cycling above minimum heat output .......... 29
L.E.D. Diagnostic light not on during a call for heat ..... 29
L.E.D. diagnostic light fl ashing:
A. Rapid Flash ............................................................. 30
B. Long Flash (2 seconds on - 2 seconds off) ............. 30
C. One Time ................................................................ 30
D. Two Times ............................................................... 31
E. Three Times ............................................................ 32
F. Four Times ............................................................... 33
G. Five Times .............................................................. 33
H. Six Times ................................................................ 33
Spark Ignition Problems
Heater not cycling above minimum heat output ...... 34
L.E.D. Diagnostic light not on during a call for heat . 34
L.E.D. diagnostic light fl ashing:
A. One Time............................................................. 34
B. Two Times ........................................................... 35
C. Three Times ........................................................ 36
D. Four Times .......................................................... 37
Components should be replaced only after each step has
been completed and replacement is suggested in the fl ow
chart.
Owner's Manual • Guardian
27
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