Table 16. Problem – Loud compressor noise
Cause Troubleshooting Remedy
1. Phase drop.
The compressor attempts to start or
operates on two phases (only applies
to 3 phase heat pumps) .
1. Check that there is 400 V between
incoming phases on the heat
pump.
2.
If there is supply to the heat
pump, measure the voltage for all
electrical components all the way
to the compressor, see wiring dia-
gram.
Check where the phase drop is and rec-
tify.
2. Touching pipes – vibrations. Establish which pipe(s) is/are causing the
problem.
Try to remove the contact:
3. Compressor fault Determine whether the compressor is
unusually loud.
•
Check with a voltmeter at a point
before and after the soft starter. The
measurement values should not dif-
fer.
If the compressor is defective, replace it.
Table 17. Problem – Shrieking, whistling noise
Cause Troubleshooting Remedy
1. Noise from the soft-starter. Measurement check the input and output
phases for the soft-starter as well as the
control signals from the heat pump card,
see wiring diagram.
If the soft-starter is defective, replace it.
2. The compressor’s safety valve
opens.
The compressor has an integrated safety
valve that opens when the pressure differ-
ence between high and low pressure sides
is too large. A whistling sound can be
heard during pressure equalisation. Use a
manometer to check at which pressure
differential pressure equalisation occurs.
Replace the compressor if the valve
opens at too low pressure or when the
compressor is stationary.
Table 18. Problem – Noise – miscellaneous
Cause Troubleshooting Remedy
1. Vibrating protective sleeves on the
pressure switches.
Establish where the vibration noise is com-
ing from.
Prevent the protection sleeve vibrating
by using insulation tape for example.
2. Vibration noise from the electrical
installation.
Check for electrical steps or similar devices
screwed to the heat pump and wall. These
can cause vibrations and noise.
Carry out according to the installation
instructions.
22 – Service instructions VMGFJ102
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