Conditions For Enabling And Automatic Starting Of Heat Pump - Viessmann Vitotronic SPS Service Instructions Manual

Troubleshooting
Overview of fault messages
TID Pp. No. Fault message
66 "Compressor temperature
C1 too high"
67 "Compressor temperature
C2 too high"
68 "Hot gas temperature C1
too high"
69 "Hot gas temperature C2
too high"

Conditions for enabling and automatic starting of heat pump

If the "Enable heat pump" display is not active
(green), the heat pump cannot switch on.
52
(cont.)
Effect
Compressor 1 is switched off
Compressor 2 is switched off
Compressor 1 is switched off
Compressor 2 is switched off
Cause
Temperature in compressor
too high
Superheating at expansion
■
valve EEV too high
Lack of refrigerant
■
Primary and/or secondary
■
temperature too high
Temperature in compressor
too high
Superheating at expansion
■
valve EEV too high
Lack of refrigerant
■
Primary and/or secondary
■
temperature too high
Hot gas temperature at com-
pressor outlet too high
Compressor has too little oil.
■
Superheating at expansion
■
valve EEV too high
Lack of refrigerant
■
Primary and/or secondary
■
temperature too high
Hot gas temperature at com-
pressor outlet too high
Compressor has too little oil.
■
Superheating at expansion
■
valve EEV too high
Lack of refrigerant
■
Primary and/or secondary
■
temperature too high