Alarm High Pressure - Danfoss Heat Pump Troubleshooting Manual

Troubleshooting Guide
Blocked strainer in the heating system return
Action:
Shut off and clean the strainer on the return row
Air in the heating system, outer jacket or in the Tws coil
Action:
Run the circulation pump in manual mode and listen for air. Switch between hot water and heating modes to check the whole heating
system. Bleed the heating system according to the heat pump installation instructions.
Closed taps or partially closed thermostats/valves in the heating system
Action:
Open any closed taps. Check that the thermostats/valves are open.
The circulation pump is defective or has jammed
Action:
Check that there is there voltage to the circulation pump. If there is no current to the circulation pump, measure at the fuse and the
relay card (See wiring diagram).
If there is current there check the wiring between relay card and circulation pump.
If there is current the circulation pump has jammed.
If this is the case, open the bleed screw and try to release the shaft using a screwdriver for example (Does not apply to the optimum
models). If it still jams, take the drive side apart, clean the drive side using a dish brush and degreaser
Reinstall the motor on the lower connection , fill with water carefully through the upper connection of the pump.
Reinstall the upper connection , open the ball valve, test run the circulation pump in a manual test.
If it is still bad or there is no flow close the ball valves and remove the screws that hold the motor. Check that the paddle wheel is secure
on the shaft.
If the paddle wheel is loose replace the circulation pump.
If the circulation pump does not function or sounds bad after cleaning replace the circulation pump.

Alarm high pressure

VMIFB202
5