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Test Operation, Troubleshooting and Maintenance
4.2 Troubleshooting
4.2.1 Diagnostics
Diagnostic name Affects signal source Description
High pressure protection High pressure cutout
When the pressure is too high or
the current exceeds the setpoint,
the corresponding compressor will
stop and the indicating LED on the
control panel will light on and the
error information will be displayed
on the error log. The error must
be manually cleared for normal
operation of next time.
Low pressure protection Low pressure cutout
• When it is detected the low-
pressure cutout of the compressor
is opened frequently, the
compressor will be shut down
immediately.
• Meanwhile, the error information
will be displayed. The error must
be manually cleared for normal
operation of next time.
High discharge protection
Discharge temperature
sensor
When it is detected that the
discharge temperature exceeds the
setpoint, the compressor will be
shut down immediately. Meanwhile,
the error information will be
displayed among the error log. The
error must be manually cleared for
normal operation of next time.
Temperature sensor
protection
Temperature sensor
• When the entering water
temperature fails, all compressors
and fans of the corresponding
single unit will stop. When the
discharge temperature sensor
fails, the display panels will tell
“Discharge temperature sensor X
error”.
• In this case, the unit can be
started normally only when it
has been unlocked. When the
antifreeze temperature sensor or
leaving water temperature sensor
fails, the display panel will display
this error. In this case, the unit
can resume normal operation
only when the error is cleared
manually.
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