Owner's manual

Code Faults Description Checking / solution

L18 HP COM.FAIL

Communication error with the heat

pump.

4 Contact the professional who takes care of maintenance

of the appliance.

L19 FAIL. PAC FLOW S.

Heat pump flow sensor error.

4 Contact the professional who takes care of maintenance

of the appliance.

L20 FAIL.RET.S.PAC

Heat pump return sensor error.

4 Contact the professional who takes care of maintenance

of the appliance.

L21 AIR IN S.FAIL

Heat pump air inlet sensor error.

4 Contact the professional who takes care of maintenance

of the appliance.

L22 AIR OUT S.FAIL

Heat pump air outlet sensor error.

4 Contact the professional who takes care of maintenance

of the appliance.

L23 S.GAS EXP FAIL

Compressor suction temperature

sensor error.

4 Contact the professional who takes care of maintenance

of the appliance.

L24 EVA.S.HP FAIL

Evaporator temperature sensor

error.

4 Contact the professional who takes care of maintenance

of the appliance.

L25 COND.S.HP FAIL

Condenser temperature sensor

error.

4 Contact the professional who takes care of maintenance

of the appliance.

5. Troubleshooting MIT iSystem

24/05/2012 - 300028952-001-01