3064298_201805 111
Troubleshooting
Fault
code
Short designation Possible cause Remedy
110 T_intake gas
(AWO)
Refrigerant temperature outside permissible
range
Lead to sensor is faulty
Sensor faulty
Check lead and plug-in connection
Check refrigerant temperature
Check/replace sensor
(condenser temperature (IRT))
111 T_hot gas Hot gas temperature outside the permissible
range (ODU, CTT sensor)
Contact service engineer
112 T_supply air Supply air temperature outside the
permissible range (ODU, OAT sensor)
Contact service engineer
118 PCB
interrupted
Bus connection interrupted between IDU and
ODU
Check bus cable and plug-in connections
No communication between HCM-3, AWO-/
EWO board, ODU
Check AWO/EWO board and HCM-3
No power supply to ODU Check ODU power supply
119 Defrost energy Defrost energy in heating circuit too low
during defrosting
Check heating circuit flow rate and electric
heater; if necessary briefly reduce the heating
circuit volume
124 AWO pressure
sensor
Pressure outside permissible range Check refrigerant temperature (ICT)
Lead to sensor is faulty Check lead and plug-in connection
125 Boiler sensor AWO Flow temperature (AWO T_boiler) outside
permissible range
Check flow temperature (AWO T_boiler)
Lead to sensor is faulty Check lead and plug-in connection
Sensor faulty Check/replace sensor
126 Evaporator
temperature sensor
Evaporator temperature outside the
permissible range (ODU, OMT sensor)
Contact service engineer
127 Refrigerant inlet
temperature sensor
Refrigerant inlet temperature outside the
permissible range (ODU, OCT sensor)
Contact service engineer
128 ODU Fault in ODU or one of its components Contact service engineer
129 Compressor Compressor fault (ODU) Contact service engineer
132 System System fault in IDU (AWO) Fault message is only for additional
information
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