Flow Chart Of Troubleshooting - Gree LSQWRF35VM/NhA-M Service Manual

4.2.2 Flow chart of troubleshooting

(1) High pressure protection
Test Operation, Troubleshooting and Maintenance
High pressure protection
Yes
Does the fan stop
running or run
reversely?
No
Does the electric
expansion valve work
normally?
No
Is the pressure switch
damaged or is the wiring
loosened ?
No
Is the finned heat
exchanger too dirty or
aged?
No
Are water pipes designed
improperly? The flow becomes
smaller when the terminal unit
is turned off.
No
Is there air inside the
system? (It often occurs
after maintenance.)
No
Does the controller
alarm incorrectly?
No
Contact the supplier.
Yes Check the fan.
Replace the coils of the
No electric expansion valve
or even the main body .
Replace the pressure switch
Yes
or rewire it.
Yes Clean the water pipes.
Yes
Adjust the water pipes.
Expel air. If necessary,
Yes
vacuum the whole system.
If this occurs frequently, the
Yes main board should be
replaced.
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