7 Regular checks
7.1 Alarms
If the display shows a green screen saver, the system is OK and no actions are required.
There are three types of alarms:
▪
Class A: Stops the heat pump. The alarm must be acknowledged.
The display shows a red screen saver.
▪
Class B: Does not stop the heat pump. The alarm must be acknowledged.
The display shows a yellow screen saver.
▪
Class C: Temporary functional deviation, no action required. Does not stop the heat pump.
The alarm is self-acknowledging.
The display shows a yellow screen saver during the functional deviation.
If an A-alarm is active, the heat pump compressor is disabled, and the hot water production will stop to provide
a notification.
If the alarm can not be acknowledged, and hot water production is needed, it is normally possible to change
the operating mode to Auxilliary heater + service, see section about "operating mode".
Press the screen, and the following window will appear:
Fig. 1: Start screen with a class A alarm
Press A new window opens, showing the alarm which has been triggered.
User Guide Mega
Thermia Värmepumpar VUJSC302
21
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