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 S40 in incorrect operating mode.
– Enter menu 4.1. ("Operating mode"). If "auto" mode
is selected, select a higher value for "stop additional
heat" in menu 7.1.10.2.
– If "manual" mode is selected, select "additional heat".
• Large hot water consumption.
– Wait until the hot water has heated up. Temporarily
increased hot water capacity can be activated in
home screen "hot water" or in menu 2.1.
• Too low hot water setting.
– Enter menu 2.2 and select a higher demand mode.
• Low hot water access with the “Smart Control”
function active.
– If the hot water usage has been low for an extended
period of time, less hot water than normal will be
produced. Activate "More hot water" in menu 2.1.
• Too low or no operating prioritisation of hot water.
– Enter menu 7.1.10.1 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 pro-
duction is reduced, which can give lower/uneven
room temperatures.
• "Holiday" activated in menu 6.1.
– Enter menu 6.1 and deactivate.
Low room temperature
• Closed thermostats in several rooms.
– Set the thermostats to max in as many rooms as
possible. Adjust the room temperature via home
screen heating, rather than choking the thermostats.
• SMO S40 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.
– If "manual" mode is selected, select "heating". If this
is not enough, then also select "additional heat".
• Too low set value on the automatic heating control.
– Go to home screen heating or menu 1.30.1 (Curve,
heating) and adjust the heating curve offset up-
wards. 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 and increase the time for when
heating is to be prioritised. Note that if the time for
heating is increased the time for hot water produc-
tion is reduced, which can give smaller amounts of
hot water.
• "Holiday mode" activated in menu 6.1.
– Enter menu 6.1 and deactivate.
• External switch for changing room temperature activ-
ated.
– Check any external switches.
• Air in the climate system.
– Vent the climate system.
• Closed valves to the climate system.
Closed valves to the climate system or heat pump.
– Open the valves.
High room temperature
• Too high set value on the automatic heating control.
– Go to home screen heating or menu 1.30.1 (Curve,
heating) and adjust the heating curve offset down-
wards. 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 activ-
ated.
– Check any external switches.
Low system pressure
• Not enough water in the climate system.
– Fill the climate system with water and check for
leaks.
NIBE SMO S40Chapter 11 | Disturbances in comfort64
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