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•
"Holiday" activated in menu 6.
–
Enter menu 6 and deactivate.
LOW ROOM TEMPERATURE
•
Closed thermostats in several rooms.
–
Set the thermostats to max in as many rooms as pos-
sible. Adjust the room temperature via the "Heating"
home screen, rather than turning down the thermostats.
•
S1256PC in incorrect operating mode.
–
Enter menu 4.1 - "Operating mode". If "Auto" mode is
selected, select a higher value for "Stop heating" in
menu 7.1.10.2 - "Auto mode setting".
–
If mode "Manual" is selected, select "Heating". If this is
not enough, also select "Additional heat".
•
Too low set value on the automatic heating control.
–
Adjust via the smart guide or home screen "Heating"
–
If the room temperature is only low in cold weather, the
curve slope in menu 1.30.1 - "Curve, heating" may need
to be adjusted upwards.
•
Too low or no operating prioritisation of heat.
–
Enter menu 7.1.10.1 - "Operating prioritisation" and in-
crease the time for when heating is to be prioritised.
Note that if the time for heating is increased, the time
for hot water production is reduced, which can give a
smaller amount of hot water.
•
"Holiday" activated in menu 6 - "Scheduling".
–
Enter menu 6 and deactivate.
•
External switch for changing room temperature activated.
–
Check any external switches.
•
Air in the climate system.
–
Vent the climate system.
•
Closed valves (QM31), (QM32) to the climate system.
–
Open the valves.
HIGH ROOM TEMPERATURE
•
Too high set value on the automatic heating control.
–
Adjust via the smart guide or home screen "Heating"
–
If the room temperature is only high in cold weather,
the curve slope in menu 1.30.1 - "Curve, heating" may
need to be adjusted downwards.
•
External switch for changing room temperature activated.
–
Check any external switches.
UNEVEN ROOM TEMPERATURE.
•
Incorrectly set heating curve.
–
Fine-tune the heating curve in menu 1.30.1.
•
Too high set value on "dT at DOT"..
–
Go to menu 7.1.6.2 (flow set. climate system) and reduce
the value of "DOT".
NIBE S1256PC
•
Uneven flow over the radiators.
–
Adjust the flow distribution between the radiators.
LOW SYSTEM PRESSURE
•
Not enough water in the climate system.
–
Fill the climate system with water and check for leaks
(see chapter "Filling and venting").
THE COMPRESSOR DOES NOT START
•
There is no heating or hot water demand, nor cooling de-
mand.
–
S1256PC does not call on heating, hot water or cooling.
•
Compressor blocked due to the temperature conditions.
–
Wait until the temperature is within the product's work-
ing range.
•
Minimum time between compressor starts has not been
reached.
–
Wait for at least 30 minutes and then check if the com-
pressor 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 pos-
sible. Fine-tune the heating curve via home screen
heating, rather than choking the thermostats.
•
Circulation pump speed set too high.
–
Go to menu 7.1.2.2 (Pump speed heating medium GP1)
and reduce the speed of the circulation pump.
•
Uneven flow over the radiators.
–
Adjust the flow distribution between the radiators.
Chapter 11 | Disturbances in comfort
63
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