Nibe VVM 500 - Resolving Common Issues

Low hot water temperature or a lack of hot
water
• 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.
• VVM 500 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 500 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 high domestic water flow.
– Reduce the domestic water flow, see technical
specifications for the hot water capacity in the
"Technical specifications" section.
• 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, less hot water
than normal will be produced. Restart the product.
• 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 pro-
duction 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 thermostats.
See the "Saving tips" section in the User manual for
more detailed information about how to best set the
thermostats.
• VVM 500 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.
• Too low or no operating prioritisation of heat.
– Enter menu 4.9.1 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 4.7.
– Enter menu 4.7 and select "Off".
• External switch for changing room temperature activ-
ated.
– Check any external switches.
• Air in the climate system.
– Vent the climate system (see page 34).
• 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.
– 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 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 (see page 34).
61Chapter 10 | Disturbances in comfortNIBE VVM 500