IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual page 34

What to do if a fault occurs in the heatpump
Compressor temperature (T6 GT6)
Possible cause 1: The compressor's working temperature is too
high
Action: 1. Press the Ackn. button.
2. Contact your dealer at repeated alarms.
Possible cause 2: Intermittent temperature rise due to abnormal
operating conditions
Action: 1. Press the Ackn. button.
2. Wait and see.
Low pressure switch (LP)
Possible cause 1: Air in the heat transfer system.
Action: 1. Press the Ackn. button.
2. Check the expansion vessel.
3. Fill with fl uid if necessary.
4. Listen for air in the system. If air is heard con-
stantly, contact your dealer.
Possible cause 2: The particle fi lter on the cold side is clogged.
Action: 1. Check the particle fi lter.
2. Clean the particle fi lter if necessary.
3. Press the Ackn. button.
Possible cause 3: Lack of refrigerant in the heat transfer circuit.
Action: 1. Press the Ackn. button.
2. Wait for the heat pump to start.
3. Check whether it bubbles continuously in the sight
glass.
4. If it bubbles continuously, contact your dealer.
Possible cause 4: The HTF pump has stopped or is set at too low
a speed.
Action: 1. Press the Ackn. button.
2. Check that the pump has not stopped or is set at
the wrong speed.
Possible cause 5: Ice formation in the heat exchanger due to a
lack of anti-freeze in the heat transfer circuit.
Action: 1. Contact your dealer.
Possible cause 6: Faulty expansion valve (the alarm appears in
time periods of 3-4 weeks.)
Action: 1. Contact your dealer.
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The menu display shows:
ALARM (GT6)
Compressor superheat
080922 16:08:15
Info Ackn.
The menu display shows:
ALARM (LP)
Low pressure switch
080922 16:08:15
Info Ackn.