Air con system not working? How to reset your isolator switch

  • Friday, 29th January, 2016

If you air conditioner won’t turn on, cool effectively or is showing and error code for unseen reasons please follow these steps which may help your system return to normal operation.

Air Conditioning Isolator Switch Master Reset

  1. Go to where the outdoor unit is.
  2. Locate the isolator switch on the unit or on the wall beside the unit, which looks like a commercial on/off switch.
  3. Turn the switch off and leave it off for an hour.
  4. Turn the isolator switch back on after an hour.
  5. Turn the unit back on from the master controller and see how the system runs.
  6. Check for error codes on the master controller e.g. EEE, E42 or F42.isolator-switch

Note: Turning off the isolator switch will cut the power from the switchboard and clear the memory of the air conditioning functions as it was doing beforehand. 

Note: Different brands have different error codes.

If your system has error codes and still won’t operate call us on 07 3395 7633 to book in for a service, fault find or possible repair.

Air Conditioning Error Codes

If your zone control panel has an error code, please try the master reset as explained above first. If the error code continues to show call us on 07 3395 7633 and we will arrange for a qualified technician to inspect the system.

At the time of installation, we provide you with an instruction/user manual. Different brands have different tips to fix unwanted error codes, which you should be able to locate in your manual. It’s a good idea to have this handy if you need to call us. Sometimes these product manuals are also available online to download. Please be aware there are multiple product manuals so download the one specific to your model of system.

Reasons for error codes and faults

There are usually many possibilities as to why your master controller may be displaying error codes or why your system is not responding. Some potential reasons are:

  • The system needs regassing
  • Old age ( wear and tear)
  • Technical faults
  • Unforeseen weather events
  • Animals damaging the system in the roof or the outdoor unit
  • Air conditioner not switched on at the control
  • The circuit breaker has tripped
  • Vermin may have chewed through controller wiring
  • Blown council service fuse
  • Your local power supplier may be doing works to your areas power supply
  • Internal fault in the air conditioner
  • Defrosting
  • Compressor delay after the restart
  • Delayed fan start on heating

General website links to common brand systems for troubleshooting problems

Actron Air






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