NOTE
Always communicate the product's serial number (14 digits) when report-
ing a fault.
Troubleshooting
If the operational interference is not shown in the display the following
tips can be used:
Basic actions
Start by checking the following possible fault sources:
႑
The switch's position.
႑
Group and main fuses of the accommodation.
႑
The property's earth circuit breaker.
႑
Correctly set load monitor (if installed).
Low hot water temperature or a lack of hot water
႑
Closed or choked filling valve for the hot water heater.
႑
Open the valve.
႑
Heat pump in incorrect operating mode.
႑
If mode "manual" is selected, select "addition".
႑
Large hot water consumption.
႑
Wait until the hot water has heated up. Temporarily increased hot
water capacity (temporary lux) can be activated in menu 2.1.
႑
Too low hot water setting.
႑
Enter menu 2.2 and select a higher comfort mode.
႑
Too low or no operating prioritisation of hot water.
႑
Enter menu 4.9.1 and increase the time for when hot water is to be
prioritised.
Low room temperature
႑
Closed thermostats in several rooms.
႑
Set the thermostats to max in as many rooms as possible. Adjust the
room temperature via menu 1.1 instead of choking the thermostats.
႑
Heat pump in incorrect operating mode.
႑
Enter menu 4.2. If mode "auto" is selected, select a higher value on
"stop heating“ in menu 4.9.2.
႑
If mode "manual" is selected, select "heating". If this is not enough,
select "addition".
႑
Too low set value on the automatic heating control.
NIBE™ F1255Chapter 4 | Disturbances in comfort68
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