Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 120
Air source heat pump, monoblock version for heating and cooling operation, with 1 integrated heating/cooling circuit
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Also See for VITOCAL 151-A:
- Operating instructions for the system user (60 pages) ,
- Manual (24 pages)
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Troubleshooting
Further messages
Message code
I.123
I.124
I.125
I.126
I.127
I.128
I.129
I.130
I.131
I.135
I.142
I.143
120
(cont.)
Meaning
Refrigerant circuit, max. return temperature reached
Refrigerant circuit, min. return temperature reached
Refrigerant circuit, max. primary inlet temperature reached
Refrigerant circuit, min. primary inlet temperature reached
Max. pressure differential for compressor start reached
Min. oil sump temperature reached
Refrigerant circuit reversal: Pressure differential too low
Heat pump start phase: Timeout
Min. evaporation temperature reached
Defrosting active
Min. compressor runtime not reached
Power-OFF enabled
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