Troubleshooting guide

10
VMIFB202
Phase drop or blown fuse
Action:
Check that all phases are present on the terminal block for incoming supply.
If not, check the fuses in the cabinet and in the safety breaker for the heat pump.
Also check that all wiring is secure.
If screw terminals are used they must be properly tightened.
If phoenix at spring terminals are used, the cables must be secure in the correct hole with load on the cable.
Disconnect the cables from the incoming terminal block for the heat pump, ensure that they are correctly stripped.
If any of the phases are not present, check backwards towards the building’s main electrical cabinet. If the phase is missing there,
contact the network supplier.
Defective soft start
Action:
Measurement check and establish that when the control card gives a signal (there must be voltage between A1 & A2 on the soft-
starter), the soft-starter releases all three phases down to the compressor.
If the soft starter has signal but is ”unevenly loaded” by amperes on the phases or if it breaks to MS alarm.
Try connecting (bridging all three phases) past the soft starter. See if it is the soft starter that is not passing the current through, but be
aware that the compressor will start immediately when the safety breaker is switched on.
Go quickly to service - manual test and start circ. pump and brine pump.
If the soft-starter does not release the phases when it receives signals from the control computer, replace it.
Defective contactor (Older models without soft starter)
Action:
Measurement check and establish that when the control computer gives a signal (there must be voltage between A1 & A2 on the
contactor)
The contactor releases all three phases down to the compressor.
If the contactor does not release the phases when it receives signals from the control computer, replace the contactor.
Troubleshooting Guide Alarm motor protection