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ALARM ON PRESSURE SWITCH LOW
To reset the alarm: Press ”Ackn”.
ALARM (LP)
Low pressure switch
020312 16.08.15
Info Ackn.
Probable causes and actions:
• Air in the heating system.
Action:Check the expansion vessel and fill if required. If air is heard continuously in the system,
contact the installer.
• Heat transfer pump has stopped or is set at too low a speed.
Action: Check the pump has not stopped or is set at the wrong speed.
• Particle filter on the cold side has clogged.
Action: Check the filter and clean if required.
• Not enough refrigerant in the circuit.
Action: Check that bubbles do not appear continuously in the sight glass. Contact the installer.
• Not enough antifreeze in the heat transfer circuit creating ice in the heat exchanger.
Action: Contact the installer.
• Expansion valve faulty (alarms occur at long intervals, about every three or four weeks).
Action: Contact the installer.
HIGH PRESSURE SWITCH ALARM
To reset the alarm: Press ”Ackn”.
ALARM (HP)
High pressure switch
020312 16.08.15
Info Ackn.
Probable causes and actions:
• Air in the heating system.
Action: Check the system and vent the radiators if necessary.
• Not enough flow over the heat pump.
Action: Check that the circulation pump has not stopped and that a valve in the system is not
shut.
• Hot side particle filter clogged.
Action: Check the filter and clean if required.
• Refrigerant circuit over-filled.
Action: Contact the installer.
• Drying filter clogged.
Action: Contact the installer.
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