Mitsubishi Heavy Industries HMK60, Installation Manual

Page: 80 / 288

78
Disturbance in comfort
Troubleshooting
If the operational interference is not shown in the display the
following tips can be used:
Basic actions
Start by checking the following possible fault sources:
■ The switch's (SF1) position.
■ Group and main fuses of the accommodation.
■ The property's earth circuit breaker.
■ The control module's miniature circuit breaker (FA1).
Low hot water temperature or a lack of
hot water
This part of the fault-tracing chapter only applies if the water
heater is installed in the system.
■ Closed or choked fi lling valve for the hot water heater.
– Open the valve.
■ Mixing valve (if there is one installed) set too low.
– Adjust the mixer valve.
■ Control module in incorrect operating mode.
– If mode "manual" is selected, select "addition".
■ 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.
■ 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.
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.
■ Control 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.
■ 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 ".
Disturbance in comfort
In most cases, the control module notes a malfunction and
indicates this with alarms and shows instructions to rectify it in
the display. See "Manage alarm" for in- formation about
managing alarms. If the malfunction does not appear in the
display, or if the display is not lit, the following
troubleshooting guide can be used.
Manage alarm
info / action
reset alarm
aid mode
Low pressure alarm
alarm
In the event of an alarm, some kind of malfunction has
occurred, which is indicated by the status lamp changing from
green continuously to red continuously. In addition, an alarm
bell appears in the information window.
Alarm
In the event of an alarm with a red status lamp a malfunction
has occurred that the heat pump and/or control module cannot
remedy itself. In the display, by turning the control knob and
pressing the OK button, you can see the type of alarm it is and
reset it. You can also choose to set the installation to aid mode.
info / action
Here you can read what the alarm means and
receive tips on what you can do to correct the problem that
caused the alarm.
reset alarm
In most cases it is enough to select "reset alarm"
to correct the problem that caused the alarm. If a green light
illuminates after selecting "reset alarm" the alarm has been
remedied. If a red light is still visible and a menu called
”alarm” is visible in the display, the problem that caused the
alarm remains. If the alarm disappears and then returns, see the
troubleshooting section (page 78 and 79).
aid mode
”aid mode” is a type of emergency mode. This
means that the installation produces heat and/or hot water
despite there being some kind of problem. This can mean that
the heat pump's compressor is not running. In this case any
electrical addition produces heat and/or hot water.
NOTE
To select aid mode an alarm action must be selected in the
menu 5.1.4.
CAUTION
Selecting "aid mode” is not the same as correcting the
problem that caused the alarm. The status lamp will
therefore continue to be red.