DE DIETRICH MIT iSystem - Manual (Page 28)

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
27 24/05/2012 - 300028952-001-01