– Enter menu 7.1.10.1 - "Operating prioritisation" and in-
crease the time for when hot water is to be prioritised.
Note that, if the time for hot water is increased, the time
for heating production is reduced, which can give
lower/uneven room temperatures.
• "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.
• S1156 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".
• 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 (accessory is required for cooling).
– S1156 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.
69Chapter 11 | Disturbances in comfortNIBE S1156
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