■
"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.
■
Circulation pump (GP6) has stopped.
–
See section "Helping the circulation pump to start"
on page 51.
■
Air in the heating system.
–
Vent the heating system (see page 32).
■
Closed valves (QM31), (QM32) to the heating system.
–
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.
■
Trim valve to supply air coil (RN1) is not adjusted.
–
Adjust the valve (see diagram on page 35).
Low system pressure
■
Not enough water in the heating system.
–
Top up the water in the heating system (see page
32).
Low or a lack of ventilation
■
Filter (HQ10/HQ11) blocked.
–
Clean or replace the filter.
■
The ventilation is not adjusted.
–
Order/implement ventilation adjustment.
■
Exhaust air device blocked or throttled down too much.
–
Check and clean the exhaust air devices.
■
Fan speed in reduced mode.
–
Enter menu 1.2 and select "normal".
■
External switch for changing the fan speed activated.
–
Check any external switches.
High or distracting ventilation
■
Filter (HQ10) blocked.
–
Clean or replace the filter.
■
The ventilation is not adjusted.
–
Order/implement ventilation adjustment.
■
Fan speed in forced mode.
–
Enter menu 1.2 and select "normal".
■
External switch for changing the fan speed activated.
–
Check any external switches.
Low supply air temperature
■
Air in the supply air battery
–
Bleed the supply air battery.
■
Trim valve too restricted (RN1)
–
Adjust the trim valve (see diagram on page 35).
High supply air temperature
■
Trim valve (RN1) not sufficiently restricted.
–
Adjust the trim valve (see diagram on page 35).
The compressor does not start
■
There is no heating requirement.
–
The heat pump does not call on heating nor hot
water.
–
The heat pump defrosts.
■
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.
55Chapter 10 | Disturbances in comfortNIBE F470
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