LOW SYSTEM PRESSURE
• Not enough water in the climate system.
– Fill the climate system with water and check for
leaks. In event of repeated filling, contact the in-
staller.
COMPRESSOR DOES NOT START
• There is no heating requirement.
– F1355 does not call on heating or hot water.
• Compressor blocked due to the temperature condi-
tions.
– Wait until the temperature is within the product’s
working range.
• Minimum time between compressor starts has not
been reached.
– Wait for at least 30 minutes and then check if the
compressor has started.
• Alarm tripped.
– Follow the display instructions.
WHINING NOISE IN THE RADIATORS
• Closed thermostats in the rooms and incorrectly set
heating curve.
– Set the thermostats to max. in as many rooms as
possible. Adjust the heating curve via menu 1.1, in-
stead of choking the thermostats.
• Circulation pump speed set too high.
– Enter menu 5.1.11 (pump speed heating medium)
and reduce the speed of the circulation pump.
• Uneven flow over the radiators.
– Adjust the flow distribution between the radiators.
NIBE F1355Chapter 5 | Disturbances in comfort54
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