An EC error code on a mini split usually indicates a Refrigerant Leakage Detection Error.
This means the system has detected a leak.
While there may be a leak in the unit, keep in mind sensors, and boards can also malfunction and cause the EC error code.
This includes Pioneer, Carrier, and more units but be sure to check the error codes for your specific unit.
There can be a difference in errors depending on the manufacturer and model, so always verify your mini split error code with the manual for the unit.
Causes of a Mini Split EC Error Code
- Refrigerant Leak
- Bad Sensor
- Bad connection
- Bad Indoor PCB
- Bad Outdoor PCB
Several things can cause an EC error with the main problem usually a leak somewhere in the system.
While a refrigerant leak is usually the problem, a bad sensor, connection, or bad PCB can also give the same error.
Causes and Fixes for a Mini Split EC Error Code
- Power Cycle Off and On the Unit
- Check for Refrigerant leak
- Bad Sensor or Loose Connection
- Bad Indoor or Outdoor Main PCB
Power the unit off and turn the power off at the breaker for 2-3 minutes.
Turn the power back on; if the error still exists, follow the next step.
When looking for a leak, see if there is any oil around connection joints or any spots on the lines.
Leaks can be found in a few ways, including using soap and water.
Most HVAC techs will have a refrigerant leak detector that beeps next to a leaking spot.
Check all the wiring connections and be sure they are fitted into place and not loose.
A bad PCB board can also give this error.
Check all other options before replacing a PCB board.