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Test Operation, Troubleshooting and Maintenance
Diagnostic name Affects signal source Description
Communication fault Main board
When the single unit fails to receive
signals from the control panel, it will
automatically be shut off.
Phase loss/reversal
protection
Phase protector
When phase loss/reversal occurs,
the phase protector will cut off the
power supply to the main board.
Protection for the water ow
switch
Contact
When a single unit detects its ow
switch is open, this module will
automatically be shut down. When
all ow switches are closed, the
water pump will stop.
Protection for the four-way
valve
Entering and leaving water
temperature sensors
When it is detected that the entering
water temperature is 4°C higher
than the leaving water temperature
and the latter continuously goes
down, the compressor will be
stopped immediately and the
control panel will display this error.
Protection for the
compressor IPM module
Drive board of the
compressor
When it is detected that the
compressor IPM current or
temperature is higher than the
setpoint, the compressor will be
stopped immediately and the
control panel will display this error.
Protection for the fan IPM
module
Drive board of the fan
When it is detected that the fan IPM
current or temperature is higher
than the setpoint, the compressor
will be stopped immediately and the
control panel will display this error.
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