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YHM Fault Code 8

Article ID: 613
Last updated: 4 Jun, 2019

York Heat Pump: YHM

Re: Flashing Code 8

Fault Code 8 = Inverter Communication Fault

The 24V Diagnostic Board communicates with the High Voltage Inverter Board. 

Qty Possible Cause Action
3 1. No Line Voltage

Check the power in and out of the unit-mounted breaker.

2. 

3. 

1

4. Bad Control Board

Replace the control board. If the problem persists, proceed to last step.

Last Step. If fault remains.

Contact JCI Technical Services.

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Article ID: 613
Last updated: 4 Jun, 2019
Revision: 6
Access: Public
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