AHP/MP Air Handler - Flashing Code 2

York Air Handler: AHP/MP

Re: Flashing Code 2

The control board in the air handler monitors the limit switch in the aux heaters.

Code 2 = Limit switch opened two times with NO CALL FOR HEAT.

► This is a Hard Lockout condition that will keep all heater outputs off.

► The blower will de-energize 5 minutes after entering Hard Lockout.


To reset: Line or Low Voltage Power to the air handler control board must be cycled.


Qty Possible Causes:
Stuck Heat Relay
Bad Control Board
Bad Limit
Shorted Heater
Stuck Contactor (OD Unit)

Checkout:

1. Check Heaters


2. Check Heater Board


3. Check Heat Relays


4. Check Limits


5. Check Compressor Contactor



Article ID: 496
Last updated: 6 Feb, 2023
Revision: 1
Equipment -> Heat Pumps -> York -> Air Handlers -> AHP/MP -> AHP/MP Air Handler - Flashing Code 2
https://ghac.makekb.com/entry/496/