26
CA Protectn device primry
Compressor stops.
Cause
Measure
No jumper present at terminals X3.8/X3.9 on the cross
connect PCB.
Check jumper at terminals X3.8/X3.9. Insert jumper if
required: See "Cross connect PCB".
CB Flow temp. primary
Compressor stops.
Cause
Measure
Min. flow temperature primary circuit (brine inlet) not
achieved.
Check primary circuit flow rate.
CC Coding card
Heat pump does not start.
Cause
Measure
Coding card cannot be read.
■
Check coding card:
Switch off heat pump control unit and check whether
coding card has been inserted correctly. Reinsert
coding card if necessary.
Replace coding card if test was unsuccessful.
■
Check controller and sensor PCB. Replace PCB if re-
quired.
CF Communication module
No communication via LON.
Cause
Measure
LON communication module not plugged in or faulty.
If necessary, replace components in the following order:
■
LON communication module.
■
Controller and sensor PCB.
Troubleshooting
Message overview
(cont.)
5800 917 GB
Maintenance