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Alarm Menu
The Alarm Menu displays any alarms and an alarm overview for the last 16 alarms. (see ALARM-
LOG).
If an alarm is triggered, the backlight in the display will flash. Operating status switches to ALARM
or STOP. You can read the cause of the alarm in the ALARM sub-menu.
The alarm is displayed with an alarm code. When the cause of the alarm is removed, the alarm
switches automatically from active to inactive and the backlight stops flashing.
To acknowledge an alarm, press the knob in the sub-menu ALARM when the alarm is displayed.
The alarm is then deleted from the alarm log.
Active alarms cannot be acknowledged before the system has registered that the alarm cause has
been eliminated.
There are three alarm levels:
INFO
: General information for the user that does not affect operation.
WARNING : Given in the event of alarms, which permit continued operation with small
inconveniences.
CRITICAL
: This type of alarm means that operation stops entirely or is significantly reduced.
High pressure alarm
Refrigerant pressure in the condenser is too high. This is due to the fact that the heat pump cannot
clear the heat it is producing. The central heating water is circulating too slowly.
Possible causes:
1. Dirt filter in the central heating system is clogged
2. There is air in the central heating system
– ventilate the system
3. There is insufficient water in the central heating system.
4. The
“hot pump” to the central heating system is not running. The pump should
buzz quietly when operating
Check 1
– 4 and correct the fault. Acknowledge the alarm by pressing the knob in the Alarm sub-
menu when the alarm is displayed.
Low pressure malfunction
Refrigerant pressure in the evaporator is too low. This is due to the fact that there is not enough
heat coming from the ground source loop. Either the brine is circulating too slowly or the brine is
too cold when it returns from the ground loop.
Possible causes:
1. There is air in the ground pipes
– ventilate the ground heat loop/ground pipes
2. There is insufficient brine in the ground pipes
3. The brine has frozen in the heat exchanger. The
“cold pump” will be very hot
4. The
“cold pump” to the ground pipes/ground source loop is not running. The
pump should buzz slightly while operating
Check 1
– 4 and correct the fault. Acknowledge the alarm by pressing the knob in the Alarm sub-
menu when the alarm is displayed. Contact a service technician if the low pressure switch shuts
down the system again after a few minutes. Don not attempt to start the system repeatedly, as this
increases the risk of frost damage to the heat pump evaporator.
