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Error 52 - APAC / Carrier / Brivis NC-4

If your APAC / Carrier / Brivis system has a NC-4 controller and is displaying error 52, your system has most likely overheated.

 

The same fault can appear on other brands, Daikin has error code E3, LG is CH34/33, Fujitsu is EE:00/EF:00.

 

Error 52 on Cooling (Summer)

The outdoor unit has overheated. This can happen during extreme heat, high 30's upwards. Other reasons are:

  • Blocking the airflow of the outdoor unit.
  • Outdoor fan not working.
  • Turning the system on late in the day where the heat has set in, including inside the home.
  • Running too many zones.
  • Running the system below 23 degrees

To rectify this, reset the unit by powering off and then back on at the circuit breaker (see related article - not working, resetting). To prevent this from happening, start your system early in the day on hot days, always maintain an indoor temperature below 30 degrees (even when not home) and keep the direct area of the outdoor unit clear.


Error 52 on Heating (Winter)

The indoor unit has overheated. This can happen for a number of reasons:

  • Blocked return air filter
  • Indoor fan not working.
  • Turning the system on heat on a warm day.
  • Running too little zones.
  • Running the system above 23 degrees
To rectify this, reset the unit by powering off and then back on at the circuit breaker (see related article - not working, resetting). 



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