• Indoor module in incorrect operating mode.
– If mode "manual" is selected, select "addition".
– Hot water is produced with the electric boiler/indoor
module in “manual” mode. If there is no electric
boiler/indoor module, “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 320 will
produce less hot water than normal. Restart the
product.
LOW ROOM TEMPERATURE
• Closed thermostats in several rooms.
• Indoor module 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 39)
• Closed valves to the climate system.
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 39).
THE AIR/WATER HEAT PUMP’S
COMPRESSOR DOES NOT START
• There is no heating requirement.
– VVM 320 does not call on heating or hot water.
• Alarm tripped.
– VVM 320 temporarily blocked, see menu 3.2 com-
pressor information.
NIBE VVM 320Chapter 10 | Disturbances in comfort68
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