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TABLE OF CONTENTS
- TROUBLESHOOTING AND REPAIR SECTION -
LN-25™
Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F
How to Use Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
PC Board Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . F-3
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Test Procedures
Gas Solenoid Valve and Solenoid PC Board Test . . . . . . . . . . . . . . . F-7
Gas Solenoid Valve and Control PC Board Test . . . . . . . . . . . . . . . . F-13
Hall Effect Module Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-19
Wire Drive Motor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-23
Contactor & Contactor PC Board Test . . . . . . . . . . . . . . . . . . . . . . . . F-25
Component Replacement Procedures
Contactor PC Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . F-31
Control PC Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-35
Contactor Replacement (codes below 10500) . . . . . . . . . . . . . . . . . F-39
Contactor Replacement (codes above 10500) . . . . . . . . . . . . . . . . . F-41
Gas Solenoid Valve and/or Solenoid
PC Board (If Present) Replacement . . . . . . . . . . . . . . . . . . . . . . . . F-43
Drive Motor And Gearbox Replacement and
Access to Hall Effect Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-47
Retest After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-51
Section FSection F
WARNING
ELECTRIC SHOCK can kill.
• Never work on the inside of the machine without removing the
input power. You can receive a life threatening electrical shock if
you fail to do this. Only qualified technicians should perform
installation, maintenance, and troubleshooting work on the
machine.
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