NOTE
Always give the product's serial number (14 digits) when reporting 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:
■
The switch's position.
■
Group and main fuses of the accommodation.
■
The property's earth circuit breaker.
Low hot water temperature or a lack of hot water
This part of the fault-tracing chapter only applies if the water heater is in-
stalled in the system.
■
Closed or choked filling valve
–
Open the valve.
■
Mixing valve (if there is one installed) set too low.
–
Adjust the mixer valve.
■
Control module in incorrect operating mode.
–
If mode "manual" is selected, select "addition".
■
Large hot water consumption.
–
Wait until the hot water has heated up. Temporarily increased hot
water capacity (temporary lux) can be activated in menu 2.1.
■
Too low hot water setting.
–
Enter menu 2.2 and select a higher comfort mode.
■
Too low or no operating prioritisation of hot water.
–
Enter menu 4.9.1 and increase the time for when hot water is to be
prioritised.
Low room temperature
■
Closed thermostats in several rooms.
–
Set the thermostats to max, in as many rooms as possible. Adjust the
room temperature via menu 1.1, instead of choking the thermostats.
NIBE™ SMO 20Chapter 4 | Disturbances in comfort64
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