Danfoss Heat Pump Troubleshooting Guide download pdf (Page 13)

VMIFB202

Troubleshooting Guide Alarm Brinepump

The circulation pump’s integrated alarm has deployed

Action:

Check if there is air in the brine circuit that can gather in the circulation pump.

Bleed the brine circuit according to the installation instructions.

Check if the circulation pump has jammed.

If the circulation pump has jammed, there is an integrated shake function that attempts to shake itself loose up to a maximum of 5

times, if it does not succeed, an alarm will occur.

Try cutting the voltage to the heat pump to stop the alarm and then manually run the circulation pump.

If the alarm recurs, repeat the procedure several times.

Check the circulation pump’s 0-10V signal

Measure the 0-10V signal between terminal 333 and 334. Go into the service menu and run the circulation pump in manual mode

30%=3V 40%=4V 50%=5V etc.

If the correct control signal is obtained there is a relay card fault.

If the correct control signal is not obtained from the control board the control board must be replaced.

If one obtains 0-10V in all operating modes and the alarm remains the internal alarm circuit in the circulation pump has probably

broken or there is a broken cable.

One can then bridge the alarm signal between 331 and 332 to remove the circulation pump’s internal alarm protection. The internal

alarm function will then be completely absent.

Replace the circulation pump if the brine circuit has been fully bled and the relay card measured so that it transmits the correct signals

but the alarm remains.

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Danfoss Heat Pump Troubleshooting Guide Page 13