Aaon WSHP Lockout Codes

Article ID: 681

Last updated: 15 May, 2024

Aaon Water-Source Heat Pump: WHA

Re: Diagnostic Codes / Error Codes / Fault Codes

The Red fault light will flash to indicate fault status.

Red Flashes	Description
1	High Pressure Switch Fault
2	Emergency Shutdown
3	Auxiliary Alarm
4	Condensate Overflow Fault
5	Low Control Voltage Alarm
6	High Control Voltage Alarm
7	Low Suction Pressure
8	Cold Leaving Water Temperature
9	Low Air Coil Temperature
10	Low Entering Water Temperature

To Reset ⇒ Cycle Power to the board or unit

WHAT TO CHECK:

Code	Cooling	Heating
1	Low water pressure Low or no water flow Water too hot Excessive refrigerant Bad high pressure switch	Low or no airflow Bad blower motor Clogged air filter Dirty indoor coil Excessive refrigerant Bad high pressure switch
2
3
4	Clogged drain hose Clogged drain line Double trapped Shorted CO sensor	N/A
5	Transformer mis-wired Low line voltage	Transformer mis-wired Low line voltage
6	Transformer mis-wired High line voltage	Transformer mis-wired High line voltage
7	Low refrigerant charge Bad expansion valve Bad low pressure switch	Low refrigerant charge Bad expansion valve Bad low pressure switch
8	N/A	Low refrigerant charge Low water flow Bad circulating pump Bad expansion valve Bad sensor
9	Low refrigerant charge Low airflow (check air filter) Bad blower motor Bad expansion valve Bad sensor	N/A
10

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Article ID: 681

Last updated: 15 May, 2024

Revision: 10

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