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Actron Air error codes

Air Conditioning FAQs

What are error codes?

Error codes are a code used to identify where something may need to be repaired or isn’t functioning as it should in your air conditioning system. Each code has a different meaning and when defined the codes can indicate the source of the problem, allowing technicians to approach it directly.

Below are the error codes for Actron Air units with their matching explanation.

What should I do when I see an error?

  1. Reset the system

Restarting the system will delete the air conditioner’s on board memory. It’s not always successful but it is worth a try before spending money on a service call.

Re-start your system by separating your air conditioning system from its power supply. Unplug it from a power point, turn off the isolator next to the outdoor unit or shut down your house’s power from the electrical board. Then leave it for 15 – 30 minutes.

  1. Call an expert

Having a professional look into your error is safe and will ensure you don’t inadvertently cause further damage to your AC unit.

Error Code Table

ESP Unit Error Fault Codes                   

Outdoor CPU: Wall Controller: Fault/Function

0: Cooling Mode

1: Heating Mode

2: Heating compressor run time >20mins

3: Heating Defrost

4: LOW speed flashes every 30s: Over Heat or Anti-Freeze Protection mode (Reduced Capacity Mode)

5: Heating mode – indoor coil pre-heat

E6: Fault discharge temperature

E7: Fault outdoor coil sensor (open or closed circuit)

E8: Fault outdoor discharge sensor (open or closed circuit)

E9*: High or Low Pressure/Phase error (3 phase models only)*

E2: Fault indoor coil out sensor

E3: Fault room sensor(s) (open or closed circuit)

E4: Fault indoor coil sensor (open or closed circuit)

E5: Communication Fault

*E9 can also indicate a phase error (incorrect phase rotation or phase loss).

M Series (AM24 and AM7) Controller

OUTDOOR CPU: AM24 Wall Control: AM7 Wall Control: Fault/Function

0: Cooling Mode

1: Heating Mode

2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.

3: Heating Mode De-ice cycle

5: Heating Mode Indoor coil pre-heat after defrost

E7: Fault: Outdoor coil sensor (open circuit)

E7: Fault: Outdoor coil sensor (closed circuit)

E9: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)

E5: Communication error between outdoor and indoor.

C Series (C7-1) Controller

OUTDOOR CPU: C7 Wall Control: Fault/Function

0: Cooling Mode

1: Heating Mode

2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.

3: Heating Mode De-ice cycle

5: Heating Mode Indoor coil pre-heat after defrost

E5: Communication error between outdoor and indoor.

E7: Fault: Outdoor coil sensor open circuit

E7: Fault: Outdoor coil sensor short circuit

E9: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)

D Series 24 Hour (AECSN) and 7 Day (AEC7N) Controller

OUTDOOR CPU: Fault/Function

0: Cooling Mode

1: Heating Mode

2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.

3: Heating Mode De-ice cycle

5: Heating Mode Indoor coil pre-heat after defrost

E5: Communication error between outdoor and indoor.

7: E1: Fault: Outdoor coil sensor open circuit

8: E1: Fault: Outdoor coil sensor closed circuit

9: (heat/cool flash): E2: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)

Notes:
  • Faults may not be displayed on the wall control until the fault occurs several times.
  • Phase error will be indicated by a red light on the 3-phase relay.
  • Phase correction must be applied to the incoming supply side.

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