Mitsubishi Heavy Industries FDCM100VNX-W - Additional Heating Only

EN-37
Disturbances in comfort
■ Too low or no operating prioritisation of heat.
−

Enter menu 4.9.1 and increase the time for when heating
is to be prioritised.
■ "Holiday mode" activated in menu 4.7.
− Enter menu 4.7 and select "Off".
■ External switch for changing the room heating activated.
− Check any external switches.
■ Air in the climate system.
− Vent the climate system.
■ Closed valves to the climate system.
−

Open the valves (contact your installer for assistance in
nding them).
■ Incorrectly adjusted ow across the heat pump.
–

Check whether alarm high condenser in (163) or high
condenser out (162) is in the alarm log. Follow the
instructions for adjusting charge ow.
High room temperature
■ Too high set value on the automatic heating control.
–

Enter menu 1.1 (temperature) and reduce the oset 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 activated.
– Check any external switches.
Low system pressure
■ Not enough water in the climate system.
– Top up the water in the climate system.
The compressor does not start
■ There is no heating requirement.
– The heat pump does not call on heating nor hot water.
■ Temperature conditions tripped.
– Wait until the temperature condition has been reset.
■

Minimum time between compressor starts has not been
reached.
–

Wait 30 minutes and then check if the compressor has
started.
■ Alarm tripped.
– Follow the display instructions.
Additional heating 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.
CAUTION
When commissioning without MHI air/water heat pump an
alarm communication error may appear in the display.
The alarm is reset if the relevant heat pump is deactivated
in menu 5.2.2 ("installed slaves" ).