LOW HOT WATER TEMPERATURE OR A LACK OF HOT
WATER
This part of the fault-tracing chapter only applies if the water heater is
installed in the system.
• Closed or choked filling valve for the hot water.
– Open the valve.
• Mixing valve (if there is one installed) set too low.
– Adjust the mixer valve.
• SMO 40 in incorrect operating mode.
– Enter menu 4.2. If mode "auto" is selected, select a higher value on
"stop additional heat" in menu 4.9.2.
– 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.
• Low hot water access with the “Smart Control” function active.
– If the hot water usage has been low, the installation will produce
less hot water than normal. Restart the installation
• 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. 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 mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
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 thermo-
stats.
NIBE SMO 40Chapter 4 | Disturbances in comfort80
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