13
Alarms
13.1
Filter Change Alarm
Cause: - The air filter must be changed or cleaned
Measure: - Turn off the main switch.
(M) Replace or vacuum the filter. The filter should always be
changed at least once a year.
(N) Reset the alarm on the display unit.
13.2
High Gas Pressure Alarm
Cause: The pressure has been too high after the
compressor and the high-pressure switch
has tripped.
In new installations, the fault usually depends on air in
the system, lack of water circulation or too small radiator
system.
The alarm may also be due to a loose contact
in the HP alarm circuit.
Measure: - See measure at Inverter Alarm 16.5.
13.3
Low pressure alarm 1
Cause: The evaporation temperature measured with the sensor
(TE6) is too low. This should be above -23 ° C. Usually
depends on too low airflow. Rarely can the expansion
valve's smallest opening be too small.
Measure: - Check if the filter is dirty or clogged.
(O) If the filter is older than 1 year, replace the filter.
(P) If the house is newly built or rebuilt, the filter may be
clogged by building dust, change filter after the new or
remodel is completed.
(Q) Verify air flow measurement.
(R) If no error was found, analyze the log file for error Cause.
13.4
Low pressure alarm 2
Cause: The evaporation pressure measured by the low-pressure
switch (IN4) is too low for at least 3 minutes. This should
be over 1.5 Bar.
(S) Stop in the air flow
(T) Dirty filter.
(U) All refrigerant has leaked.
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