Gree GWH07QA-K6DNC4A Service Manual page 120

4. ODU Fan Motor Cant Operate
Possible causes
Wrong wire connection, or poor
connection
Capacity of the ODU fan motor is
damaged
Power voltage is a little low or high
Motor of outdoor unit is damaged
5. Compressor Cant Operate
Possible causes
Wrong wire connection, or poor
connection
Capacity of compressor is
damaged
Power voltage is a little low or high
Coil of compressor is burnt out
Cylinder of compressor is blocked Compressor cant operate
6. Air Conditioner is Leaking
Possible causes
Drain pipe is blocked
Drain pipe is broken
Wrapping is not tight
7. Abnormal Sound and Vibration
Possible causes
When turn on or turn off the unit,
the panel and other parts will
expand and theres abnormal sound
When turn on or turn off the unit,
theres abnormal sound due to flow
of refrigerant inside air conditioner
Foreign objects inside the indoor
unit or therere parts touching
together inside the indoor unit
Foreign objects inside the outdoor
unit or therere parts touching
together inside the outdoor unit
Short circuit inside the magnetic
coil
Abnormal shake of compressor
Abnormal sound inside the
compressor
118
Discriminating method (air conditioner status)
Check the wiring status according to circuit
diagram
Measure the capacity of fan capacitor with an
universal meter and find that the capacity is out of
the deviation range indicated on the nameplate of
fan capacitor.
Use universal meter to measure the power supply
voltage. The voltage is a little high or low
When unit is on, cooling/heating performance is
bad and ODU compressor generates a lot of noise
and heat.
Discriminating method (air conditioner status)
Check the wiring status according to circuit
diagram
Measure the capacity of fan capacitor with an
universal meter and find that the capacity is out of
the deviation range indicated on the nameplate of
fan capacitor.
Use universal meter to measure the power supply
voltage. The voltage is a little high or low
Use universal meter to measure the resistance
between compressor terminals and its 0
Discriminating method (air conditioner status)
Water leaking from indoor unit
Water leaking from drain pipe
Water leaking from the pipe connection place of
indoor unit
Discriminating method (air conditioner status)
Theres the sound of "PAPA"
Water-running sound can be heard
Theres abnormal sound fro indoor unit
Theres abnormal sound fro outdoor unit
During heating, the way valve has abnormal
electromagnetic sound
Outdoor unit gives out abnormal sound
Abnormal sound inside the compressor
Troubleshooting
Connect wires according to wiring diagram to make
sure all wiring terminals are connected firmly
Replace the capacity of fan
Suggest to equip with voltage regulator
Change compressor oil and refrigerant. If no better,
replace the compressor with a new one
Troubleshooting
Connect wires according to wiring diagram to make
sure all wiring terminals are connected firmly
Replace the compressor capacitor
Suggest to equip with voltage regulator
Repair or replace compressor
Repair or replace compressor
Troubleshooting
Eliminate the foreign objects inside the drain pipe
Replace drain pipe
Wrap it again and bundle it tightly
Troubleshooting
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
Normal phenomenon. Abnormal sound will
disappear after a few minutes.
Remove foreign objects. Adjust all parts position
of indoor unit, tighten screws and stick damping
plaster between connected parts
Remove foreign objects. Adjust all parts position
of outdoor unit, tighten screws and stick damping
plaster between connected parts
Replace magnetic coil
Adjust the support foot mat of compressor, tighten
the bolts
If add too much refrigerant during maintenance,
please reduce refrigerant properly. Replace
compressor for other circumstances.
Installation and Maintenance
Service Manual