Cb Flow Temp. Primary - Viessmann VITOTRONIC 200 Service Instructions Manual

Troubleshooting
Message overview

CB Flow temp. primary

Compressor stops.
Cause
Min. flow temperature in primary circuit (brine inlet/air
intake) not achieved.
CC Coding card
Heat pump does not start.
Cause
Coding card cannot be read.
CF Communication module
No communication via LON.
Cause
LON communication module not plugged in or faulty.
D1 Compressor safety
Compressor stops.
Cause
Compressor fault:
Separate compressor motor overload relay (if instal-
■
led) has responded.
Motor overload relay has responded.
■
98
(cont.)
Measure
: Check primary circuit flow rate.
■
: Outside temperature outside the application limits,
■
no measures required.
Measure
Check coding card:
■
Switch off heat pump and check whether coding card
has been inserted correctly; reinsert if necessary.
Replace coding card if test was unsuccessful.
Check controller and sensor PCB and replace if nec-
■
essary.
Measure
If necessary, replace components in the following order:
LON communication module.
■
Controller and sensor PCB.
■
Measure
Check compressor power connections. Check the
■
winding resistance of the compressor motor. Check
phase sequence on compressor.
The switching signal of the motor overload relay can be
checked at connection 215.7: See "Main PCB".
0 V Motor overload relay has responded.
230 V~ Motor overload relay has not responded.
Note
The internal motor overload relay prevents re-enabling
of the compressor for 1 to 3 h if the motor overheats.