Low hot water temperature or a lack of hot
water
• Closed or choked filling valve for the hot water heater.
– Open the valve.
• VVM 225 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".
– Hot water is produced with VVM 225 in "manual"
mode. If there is no air/water heat pump, "addition"
must be activated.
• 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, VVM 225 will
produce less hot water than normal. Restart the
product.
• "Holiday mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
Low room temperature
• Closed thermostats in several rooms.
• VVM 225 in incorrect operating mode.
– Enter menu 4.2. If mode "auto" is selected, select a
higher value on "stop heating" in menu 4.9.2.
– If mode "manual" is selected, select "heating". If this
is not enough, select "addition".
• Too low set value on the automatic heating control.
– Enter menu 1.1 "temperature" and adjust the offset
heating curve up. If the room temperature is only
low in cold weather the curve slope in menu 1.9.1
"heating curve" needs adjusting up.
• "Holiday mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
• External switch for changing the room heating activ-
ated.
– Check any external switches.
• Air in the climate system.
– Vent the climate system (see page 35).
• Closed valves to the climate system or heat pump.
– Open the valves.
High room temperature
• Too high set value on the automatic heating control.
– Enter menu 1.1 (temperature) and reduce the offset
heating curve. If the room temperature is only high
in cold weather the curve slope in menu 1.9.1
"heating curve" needs adjusting down.
• External switch for changing the room heating 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 (see page 35).
The air/water heat pump’s compressor does
not start
• There is no heating requirement.
– VVM 225 does not call on heating or hot water.
• Compressor blocked due to the temperature condi-
tions.
– Wait until the temperature is within the product’s
working range.
• Minimum time between compressor starts has not
been reached.
– Wait for at least 30 minutes and then check if the
compressor has started.
• Alarm tripped.
– VVM 225 temporarily blocked, see menu 3.2 com-
pressor information.
Electrical addition only
If you are unsuccessful in rectifying the fault and are
unable to heat the house, you can, whilst waiting for
assistance, continue running the heat pump in ”add.
heat only”. This means that additional heating only is
used to heat the house.
SET THE INSTALLATION TO ADDITIONAL
HEAT MODE
1.
Go to menu 4.2 op. mode.
2.
Mark ”add. heat only” using the control knob and
then press the OK button.
3.
Return to the main menus by pressing the Back
button.
NIBE VVM 225Chapter 10 | Disturbances in comfort64
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