TM9Y - Flashing Code 9

York Gas Furnace: TM9Y

Re: No Heat or Cool - Flashing Code 9

Code 9 = Indicates reversed line voltage polarity, reversed low voltage wiring, or Grounding problem

Qty Possible Causes:
1 Loose Ground
Missing Ground
Reversed Line Voltage ("Hot" on white)
Reversed Low Voltage
Loose "Neutral" Wire
Bad Control Board


CHECKOUT:

1. Check Grounding & Power


2. Check Neutral


3. Check Low Voltage Polarity



Article ID: 705
Last updated: 20 Apr, 2022
Revision: 1
Equipment -> Gas Furnaces -> York -> TM9Y -> TM9Y - Flashing Code 9
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