Service Manual

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Table of Contents
Serial Number Breakdown .......................................................................................................................................................................... 3
How to Use this Manual ........................................................................................................................................................................... 4
Tools Required for Service ...................................................................................................................................................................... 5
SECTION 1: SERIAL NUMBERS “XF-” (JUN. 2021 AND LATER) WITH “-NDD” DESIGNATOR
ICON Features .......................................................................................................................................................................................... 5
Specifications ........................................................................................................................................................................................... 6
Intake Vent Tables and Approved Venting Materials ............................................................................................................................ 8
Sequence of Operation ............................................................................................................................................................................ 9
Building Management Systems ............................................................................................................................................................ 11
Troubleshooting ..................................................................................................................................................................................... 13
Service Procedure I: Thermostat Circuit Testing and Replacement .................................................................................................. 23
Service Procedure II: Combustion System Testing and Replacement .............................................................................................. 27
Service Procedure III: Burner Tube Inspection and Replacement ..................................................................................................... 31
Service Procedure IV: Gas Valve Replacement ................................................................................................................................... 33
Service Procedure V: Blower Testing and Replacement .................................................................................................................... 34
Service Procedure VI: Flame Sensor Testing and Replacement ........................................................................................................ 36
Service Procedure VII: Spark Rod Gap Adjustment and Replacement ............................................................................................. 38
Service Procedure VIII: Ignition Module/Control Board Replacement ............................................................................................... 40
Service Procedure IX: Anode Inspection and Replacement ............................................................................................................... 41
Service Procedure X: Display Module Replacement ........................................................................................................................... 42
Service Procedure XI: Transformer Replacement ............................................................................................................................... 43
SECTION 2: SERIAL NUMBERS “XL-” (NOV. 2021 AND LATER) WITH “-NDD-895” DESIGNATOR
Specifications ......................................................................................................................................................................................... 44
Intake Vent Tables and Approved Venting ........................................................................................................................................... 46
Sequence of Operation .......................................................................................................................................................................... 47
Troubleshooting ..................................................................................................................................................................................... 49
Service Procedure I: Thermostat Circuit Testing and Replacement .................................................................................................. 64
Service Procedure II: Combustion System Testing and Replacement .............................................................................................. 68
Service Procedure III: Burner Tube Inspection and Replacement ..................................................................................................... 72
Service Procedure IV: Gas Valve Replacement ................................................................................................................................... 74
Service Procedure V: Blower Testing and Replacement .................................................................................................................... 75
Service Procedure VI: Flame Sensor Testing and Replacement ........................................................................................................ 77
Service Procedure VII: Spark Rod Gap Adjustment and Replacement ............................................................................................. 79
Service Procedure VIII: Ignition Module/Control Board Replacement ............................................................................................... 81
Service Procedure IX: Anode Inspection and Replacement ............................................................................................................... 82
Service Procedure X: Display Module Replacement ........................................................................................................................... 83
Service Procedure XI: Transformer Replacement ............................................................................................................................... 84
Water Heater Service Report ................................................................................................................................................................. 86
Notes ....................................................................................................................................................................................................... 87
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