Air Conditioner Service Manual
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temperature stop working protection will be reset to zero and start a new counting process.
The failure and times for protection will eliminate immediately once the unit to be switched off, or changed to fan
mode.
Note: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed.
4.1.10.3 The current protection
1. If the unit A/C working current more than Limited current (I
LC
), the compressor will be frequency limited / reduced
for over current protection.
2. When unit A/C working current more than Stopped current (I
SC
), AC unit stops working. Only when the compressor
stops for 3 min can the unit be recovered operation.
3. If unit have 6 times of over current stop-working protection continuously, this protection can’t be recovered
unless press ON/OFF button.
In the process of unit operation, once the compressor runs continuously more than 6 min, the counter of stop-working
protection will be reset to zero and re-start a new counting process.
Note: For different models, I
LC
and I
SC
have different programmed value.
4.1.10.4 IPM overheating protection
1. When IPM temperature T
IPM
≥87℃, the compressor will be frequency limited / reduced for IPM over temperature
protection.
2. When T
IPM
≥95℃, the AC unit stops working for AC system protection.
If T
IPM
＜87℃,and after compressor stopped for 3 min, can the unit be started to operate.
3. If unit have 6 times of IPM over temperature stop working protection continuously, this protection can’t be
recovered unless press ON/OFF button, and unit will show failure code.
In the process of operation, once the compressor runs continuously more than 6 min, the counter of over load stop
working protection will be reset to zero and re-start a new counting process.
The failure and times for protection will eliminate immediately once the unit to be switched off, or changed to fan
mode.
Note: If the defective failure can’t be recovered, the failure can’t eliminate even if operation mode changed.
4.1.11 Complementary
4.1.11.1 Energy saving (ECO)
Function effective on Cooling and Heating mode only.
On cooling mode, the set temperature range from 26℃ to 31℃,on heating mode, from 16℃ to 25℃.
4.1.11.2 TURBO
Function effective on Cooling, Heating, Fan and Auto modes, and fan speed operates on highest.
4.1.11.3 The communication control
If ODU PCB can’t get signal feedback from IDU for 2 min continuously, AC unit stops working and shows E0 error
code as IDU/ODU communication failure.
Once the IDU & ODU communication recovery, and also the compressor stopped for 3 min already, can the unit be
recovered to operate.
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