Appendix
40
Installation instructions aroTHERM 0020147164_07
Code
Meaning
Cause
F.752
Fault: Inverter
–
The "Max. duration power supply cut-off" parameter has been
set poorly (see the "Heat pump setting parameters" section in
the appendix).
–
Inverter box damaged
–
The cooler inverter box is blocked.
–
Faulty voltage supply
F.753
Connection fault: Inverter not recognised
–
The "Max. duration power supply cut-off" parameter has been
set incorrectly (see the "Heat pump setting parameters" section
in the appendix).
–
The connection between the main PCB and the inverter box is
damaged or broken.
–
The inverter box is not switched on.
F.754
Fault: Fan unit
–
The connection between the main PCB and the fan PCB is dam-
aged or broken.
–
The fan PCB is faulty
F.755
Fault: 4-way valve position incorrect
Mechanical or electrical problem. Move the 4-way valve away from
the controller. When moving it, check that the coil voltage is correct.
F.774
Sensor fault: Air inlet temperature
–
The temperature sensor is faulty or incorrectly connected to the
main PCB.
F.1288
Fault: SP1 cylinder temperature sensor
Sensor is faulty or has not been correctly connected to the VWZ AI
heat pump control module.
Connection fault: Accessory modules
Fault in the VWZ AI heat pump control module (the connection
between the display and the main PCB is faulty).
Connection fault: Heat pump
The eBUS connection between the heat pump and the VWZ AI heat
pump control module is faulty.
1) Sensor on the evaporator
2) Sensor on the condenser
For further technical information, please call 0844 6933 133.
