6
Regular checks
6.1
Operation check
ALARM
LOW PRESSURE ERROR
During normal operation, the alarm indicator is lit green continuously
to show that everything is OK. When the alarm is triggered, it flashes
green at the same time as a text message is shown in the display.
Regularly check the alarm indicator to ensure that the installation is
working correctly. In event of an alarm the heat pump will, if possible,
supply heating to the house, primarily with the compressor, secondari-
ly with the immersion heater. Hot water production will stop to indi-
cate that a significant event has occurred.
6.2
Alarm
If an event occurs that triggers an alarm this is indicated in the display with the text ALARM and the relevant
alarm message. The possible alarm messages are:
Message
Meaning
HIGH PRESSURE
ERROR
The heating circuit is the heat pump's high pressure circuit. Check and, if necessary, recti-
fy the circuit level as below. Reset the alarm as below.
LOW PRESSURE
ERROR
The brine circuit is the heat pump's low pressure circuit. Check the circuit level as below.
Contact the service technician.
ERR PHASE SEQ.
Can be displayed in conjunction with interference in the mains network, for example af-
ter a temporary power cut. Reset the alarm as below. If necessary, switch the power sup-
ply off for a minute or two.
Other alarm mes-
sage
Reset the alarm as below. If the alarm remains, contact a service technician.
For alarms that are not reset automatically, acknowledgement is required. Acknowledge the alarm by setting
the heat pump to operating mode OFF and then back to the desired operating mode.
User Guide
Domestic heat pumps
VUGFD202
Thermia Värmepumpar
18
