Troubleshooting - L.B.White Guardian AB250 Manual Del Usuario E Instrucciones

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 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.
• Thermocouple Diagnostic Kit - (Part
No. 550-08506) When used with a standard
digital multimeter, this kit allows testing of the
thermocouple and electromagnetic power unit
strength of the pilot safety gas control valves.
• 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.
Guardian LP or Natural Gas Heater
To effectively use the flow charts, you must first identify
the problem . The problems are numbered sequentially,
along with a brief explanation of each problem. Start
at the "diamond" closest to the identified problem and
proceed with each step, performing whatever tests are
suggested. After each step or test, the guide will direct
the service person to the next logical step based on the
outcome of the previous check.
Problem
1 Pilot will not light...........................................26
2 Pilot will not stay lit when pilot control
button is released .........................................27
3 Motor runs.
Burner does not light with pilot light lit ..........28
4 Motor does not run, heater does not light
with pilot light lit ............................................29
5 Pilot will not stay lit when main burner and
blower are operating ....................................29
6 High limit switch is open ...............................30
7 Burner does not shut off ...............................31
8 Flame lifting off of burner .............................31
9 Burner flame drops out after 10-15 minutes
of operation ..................................................31
10 Gas control valve chatters ............................32
11 Motor hums ..................................................32
Owner's Manual • Guardian
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