Error Codes - ALLIANCE 120 Series Installation, Operation & Maintenance Manual

Error Codes

Display
Open thermistor error
OP
Shorted thermistor error
SH
Airflow switch closed when cycle
AF - 1
started
Airflow switch failed to close after cycle
AF - 2
started
Bouncing Airflow Switch
AF
(Flashing)
Airflow Switch Closed when Resuming
AF
Cycle
(Solid)
70458101 (EN)
Definition
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Corrective Action
Check thermistor. Replace if inoperative.

Check wiring diagram between control and

thermistor. Refer to wiring diagram for proper
wiring.
Check control. Replace if inoperative.

Check thermistor. Replace if inoperative.

Check wiring between control and thermistor. Refer

to wiring diagram for proper wiring.
Check control. Replace if inoperative.

Check airflow switch. Replace if inoperative.

Check airflow switch. Replace if inoperative.

Check airflow switch to ensure that it is properly

aligned and securely mounted in the mounting
bracket.
Make sure airflow switch can open and close freely.

Check installation and make sure there is adequate

airflow.
Make sure exhaust is not blocked.

Clean the lint screen.

Replace airflow switch if inoperative.

Allow up to 20 seconds for this condition to clear.

Check if airflow switch opens at end of cycle.

Replace airflow switch if inoperative.

Operating Instructions
55