Danfoss Heat Pump Wartungshandbuch PDF herunterladen (Seite 16)

VMBMD302

10 Troubleshooting

Alarm

In the event of an error message try restarting the installation using the reset button on the control panel.

If restarting the heat pump does not help try rectifying the problem using the table below.

Message Meaning Cause Remedy

LOW PRESS

ERROR

Low pressure

error - The com-

pressor stops

and there is no

hot water pro-

duction.

Not enough anti-freeze in the

coolant system. Air in the brine

system. Blocked filter in the

brine system.

Fill the refrigerant with the correct

percentage of anti-freeze and bleed

using the safety valve on the volume

container. Check if the strainer needs

cleaning.

Coolant pump has stopped or

is running at slow speed.

Take temperature difference

readings between incoming and

outgoing coolant. The difference

should be between approximately

3-5°C.

Ice build up in the coolant

system.

Measure the amount of anti-freeze

in %, wait until the ice melts, which

affects the low pressure switch not

contacting the wiring.

Underfilled cooling system or

any leaks.

Drain and leak trace as well as filling

new refrigerant. No refilling of drai-

ned medium.

Blocked or filled drying filter in

the cooling circuit.

Measure the temperature difference

of the filter – max 2°C.

HIGH PRESS

ERROR

High pressure

error - The com-

pressor stops

and there is no

hot water pro-

duction.

Insufficiently opened radiator/

floor loop thermostats. Air in

the heating system. Blocked

strainer in the heating system,

located in the heat pump

return.

Open radiator / floor loop thermo-

stats. Fill and bleed the heating

system. Measure delta over the

heat pump supply and return lines.

Temperature difference.

Overfilled refrigerant circuit. Draining the refrigerant circuit and

refilling with new refrigerant, accor-

ding to the instructions.

Heat transfer fluid pump has

stopped or is running at slow

speed.

Check the heart transfer fluid pump.

MOTOR P

ERROR

Motor protec-

tion error - (Over

current relay

compressor or

brine pump).

The compressor

stops and there

is no hot water

production.

Phase drop or blown fuse. Check the fuses and cable terminals

(power supply to the compressor or

brine pump).

Poorly tightened electrical

connections.

Check the electrical connections.

Too low network voltage. Measure the voltage to the heat

pump’s electrical connection.

Other alarms;

See separate manual for the control system.

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