Air Con System Not Working? How To Reset Your Isolator Switch!

  • Monday, 8th June, 2020

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. Locate your outdoor unit.
  2. Locate the isolator switch on the unit or on the wall beside the unit. It looks like a commercial on/off switch.
  3. Turn the switch off and leave it off for one (1) hour.
  4. Turn the isolator switch back on after one (1) 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.

Please note: Different brands, have different error codes. 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. 

If your system has error codes and still won’t operate please 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, please 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 be sure to 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 re-gassing
  • 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

Here are some general website links to common brand systems for troubleshooting problems:

Actron Air      Samsung      Daikin      Fujitsu    LG     Mitsubishi