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XP15 Defrost Board Diagnostic / Fault Codes

Article ID: 599
Last updated: 13 Feb, 2019

Lennox XP15 Heat Pump

Re: Defrost Board Diagnostic Codes / Fault Codes

The defrost board uses two LEDs for diagnostics. The LEDs flash a specific sequence according to the condition.


DIAGNOSTIC CODES:

Green Red Description
Off Off No Power to Control
Simultaneous Slow Normal Operation
Alternating Slow Anti-Short Cycle Delay
Off Slow Low Pressure Fault
Off On low Pressure Lockout (5 trips)
Slow Off High Pressure Fault
On Off High Pressure Lockout (5 trips)
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Article ID: 599
Last updated: 13 Feb, 2019
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