A2 Compressor 2 - Viessmann VITOTRONIC 200 Service Instructions Manual

Message overview
(cont.)
Cause
Motor overload relay has responded.
■
Compressor was switched OFF by the refrigerant cir-
■
cuit controller.
Note
The event counter is reset as soon as the compressor
has been operational continuously once for "Opti-
mum runtime compressor 500A".

A2 compressor 2

Compressor 2 in a 2-stage refrigerant circuit is
switched OFF.
Cause
One of the following events has occurred 9 times:
High pressure limit exceeded
■
High pressure limit not reached
■
Excessively high hot gas temperature
■
Low pressure limit undershot
■
Flow switch has responded.
■
Suction gas superheating too low
■
Motor overload relay has responded.
■
Compressor was switched OFF by the refrigerant cir-
■
cuit controller.
Note
The event counter is reset as soon as the compressor
has been operational continuously once for "Opti-
mum runtime compressor 500A".
A6 Secondary pump
No flow rate in the secondary circuit: Secondary
■
pump is not running.
The change in the secondary circuit flow temperature
■
for central heating/cooling is insufficient.
Action
Check the compressor oil level. Top up with oil if re-
■
quired.
Check if there is excess oil in the oil separator. Have
■
the refrigerant circuit checked by a refrigeration engi-
neer if necessary.
Note
After removing the fault, switch the appliance first off
and then on again.
Action
Scanning further heat pump messages: "Message
■
history"
Observe messages from the refrigerant circuit con-
■
troller: "Diagnosis" "Refrigerant circuit"
sage history"
Check flow rates.
■
Check motor currents/motor overload relay.
■
Check safety high pressure switch.
■
Check the compressor oil level. Top up with oil if re-
■
quired.
Check if there is excess oil in the oil separator. Have
■
the refrigerant circuit checked by a refrigeration engi-
neer if necessary.
Note
After removing the fault, switch the appliance first off
and then on again.
Troubleshooting
"Mes-
91