Low hot water temperature or a lack of hot
water
• Closed or throttled externally mounted filling valve for the
hot water.
– Open the valve.
• Mixing valve (if there is one installed) set too low.
– Adjust the mixer valve.
• VVM S320 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 - "Auto mode setting".
– Hot water is produced with VVM S320 in "Manual" mode.
If there is no air/water heat pump, "Additional heat"
must be activated.
• Large hot water consumption.
– Wait until the hot water has heated up. Temporarily in-
creased hot water capacity can be activated in the "Hot
water" home screen, in menu 2.1 - "More hot water" or
via myUplink.
• Too low hot water setting.
– Enter menu 2.2 - "Hot water demand" 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 pro-
duced. Activate "More hot water" via the "Hot water”
home screen, in menu 2.1 - "More hot water" or via my-
Uplink.
• Too low or no operating prioritisation of hot water.
– 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.
• VVM S320 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, 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 to the climate system or heat pump.
– 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").
61Chapter 11 | Disturbances in comfortNIBE VVM S320
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