
112
3064298_201507
55. Troubleshooting
Fault
code
Short designation
Possible cause
Remedy
108
Low pressure
Low pressure fault (ODU)
(refrigerant circuit / intake gas side)
Contact service engineer
109
High pressure
High pressure fault (ODU)
(refrigerant circuit / hot gas side)
Contact service engineer
110
T_intake gas
(AWO)
Refrigerant temperature outside permissible
range
Cable to sensor is faulty
Sensor faulty
Check cable and plug-in connection
Check refrigerant temperature
Check / replace sensor
111
T_hot gas
Hot gas temperature outside permissible
range (ODU)
Contact service engineer
112
T_supply air
Supply air temperature outside permissible
range (ODU)
Contact service engineer
116
ESM (E1)
External fault reported at programmable input
E1
Rectify the external fault
Check cable and plug-in connection
118
PCB
interrupted
BUS connection of AWO BUS interrupted,
no communication with ODU
No power supply to ODU
Check power cable of AWO BUS cable and
plug-in connections
Check ODU power supply
119
Defrost energy
Defrost energy in heating circuit too low
during defrosting
Check heating circuit flow rate and electric
heating, if necessary briefly reduce the heating
circuit volume
124
AWO pressure
sensor
Pressure outside permissible range
Check condenser temperature
Cable to sensor is faulty
Check cable and plug-in connection
125
Boiler sensor AWO Flow temperature (AWO T_boiler) outside
permissible range
Check flow temperature (AWO T_boiler)
Cable to sensor is faulty
Check cable and plug-in connection
Sensor faulty
Check / replace sensor
126
Evaporator
temperature sensor
Evaporator temperature outside permissible
range (ODU)
Contact service engineer
127
Refrigerant inlet
temperature sensor
Refrigerant inlet temperature outside
permissible range (ODU)
Contact service engineer
128
ODU
ODU or ODU component faulty
Contact service engineer
129
Compressor
Compressor faulty (ODU)
Contact service engineer
130
Invalid model
Invalid assignment of parameters to outdoor
unit (ODU)
Contact service engineer
131
Excess
temperature, heat
exchanger
Temperature for heat exchanger of indoor
unit or outdoor unit is too high
Automatic reset by control unit
132
System
System fault in IDU (AWO)
Fault message is only for additional
information