Viessmann VITOCAL 151-A - What to Do If...; Rooms Are Too Cold; Rooms Are Too Hot

48
Cause Remedy
The heat pump is switched off.
■
Reset the MCB in the power distribution board (main
domestic MCB).
■
Switch ON the mains isolator (if installed, outside the
boiler room).
■
Turn on the ON/OFF switch: See page 45.
Settings have been changed or are incorrect. Room heating must be switched on.
Check the settings and correct if required:
■
Operating programs: See page 19.
■
Room temperature: See page 25.
■
Time: See page 36.
■
Time program for room heating: See page 26.
■
Heating curve: See page 26.
■
The holiday program is switched on: See page 28.
The DHW cylinder is being heated.
■
Wait until the DHW cylinder has been heated up.
■
Reduce the DHW draw-off rate or temporarily reduce
the set DHW temperature if necessary.
"Status", "Warning", "Information", "Faults" or
"Service messages" is shown on the display.
■
Check what type of fault it is.
■
Make a note of the fault message and acknowledge
the fault: See page 43.
■
Please notify your heating contractor.
"Screed drying" is switched on. No action required.
After expiry of the screed drying time, the selected op-
erating program is switched on.
Rooms are too hot
Cause Remedy
Settings have been changed or are incorrect. Check the settings and correct if required:
■
Operating programs: See page 19.
■
Room temperature: See page 25.
■
Time: See page 36.
■
Time program for room heating/room cooling: See
page 26.
■
Heating curve: See page 26.
■
The "Holidays at home" function is switched on:
See page 28.
"Status", "Warning", "Information", "Faults" or
"Service messages" is shown on the display.
■
Check what type of fault it is.
■
Make a note of the fault message and acknowledge
the fault: See page 43.
■
Please notify your heating contractor.
"Screed drying" is switched on No action required.
After expiry of the screed drying time, the selected op-
erating program is switched on.
What to do if...
Rooms are too cold
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