Gree GKH(12)BA-K3DNA1A/I, Service Manual

Page: 133 / 207

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Service Manual
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129
3.3 Malfunction display: Discharge temperature protection
Discharge temperature protection
Measure the
discharge temperature: does it have
reached 125
℃
?
Check and repair the leakage of the unit. Charge
refrigerant according to the required volume
Replace the oudoor
unit mainboard
Measure
resistance value of discharge
temperature sensor: is it
correct(50K Ω )?
Replace relevant discharge
temperature sensor
Are the
electronic expansion valves
broken?
When the
discharge temperature is higher than
110 ℃ , whether the compressor reduces
its capacity?
Check the
capacity demand of indoor units:
is it in the range of outdoor
unit capacty ?
Yes
Replace relevant electronic
expansion valve
Replace the oudoor
unit mainboard
Refer to the dial-up of indoor
and outdoor unit
No
Yes
Yes
Yes
Yes
No
No
No
No
3.4 Malfunction display: Current protection
Current protection
Check the
wiring of the compressor: is it
properly connected?
Is the current
value higher than the preset
value of protector?
Is the
high pressure normal?
Is the
voltage normal?
Replace the mainboard
Adjust the compressor
wiring
Replace the overcurrent
protector
Refer to high voltage
protection
Contact the power supply
company
Yes
No
Yes
Yes
Yes
No
No
No