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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
Access: Public
Views: 2725
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