EBOOK - U Match Series DC Inverter Service Manual (Gree Air Conditioner)

1  E1 High pressure protection 

High pressure switch 

When outdoor unit detects the high pressure switch is cut off for 3s successively, high pressure protection will occur. All the loads (except the 4 -way valve in heating mode) will be switched off. In this case, all the buttons and remote control signals except ON/OFF button will be disabled and cannot be  recovered  automatically.  Switch  off  the  unit  or re-energize the unit after cutting off power to eliminate this protection.

2  E2 Freeze protection 

Indoor evaporator temperature sensor 

If  detecting  that  the  evaporator  temperature  is  lower  than protective temp. value after the unit has been running for a period of time under cooling or dry mode, the unit will report this  fault,  in  which  case  the  compressor  and  outdoor  fan motor will be stopped. The unit will not run until evaporator temperature  is  higher  than  the  protective  temp.  value  and the compressor is stopped for 3min.

3  E3 Low pressure protection 

Low pressure switch 

If it is detected within 30s successively tha t the low-pressure switch  is  cut  off  under  ON  or  standby  state,  the  unit  will report  low  pressure  protection.  If  the  fault  occurs successively  3  times  within  30min,  the  unit  cannot  be recovered automatically.

Refrigerant lacking protection 

If  the  unit  reports  system  refrigerant  lacking  within  10min after turning on the unit, the unit will stop operation. If the fault  occurs  successively  3  times,  the  unit  cannot  be recovered automatically.

Refrigerant recycling mode 

If  enter  refrigerant  recycling  m ode  through  special operation,  E3  will  be  displayed.  After  exiting  refrigerant recycling mode, the code will disappear.

4  E4 Compressor high discharge temperature protection 

Compressor discharge temperature is high 

If  outdoor  unit  detects  that  the  disch arge  temperature  is higher than protective temp. value, the unit will report high discharge  temperature  protection.  If  the  protection  occurs over  6  times,  the  unit  cannot  be  recovered  automatically. Switch  off  the  unit  or  re-energize  the  unit  after  cutting  off power to eliminate this protection.

6  E6 Communication malfunction 

Communicati on between indoor and outdoor mainboard 

If  the  outdoor  unit  does  not  receive  data  from  indoor  unit, communication  malfunction  will  be  reported.  If  there  is communication abnormity between display board and indoor unit, communication malfunction will be reported too.

8  E8 Malfunction of indoor fan motor 

Indoor fan motor 

If  the  indoor  unit  does  not  receive  signal  from  indoor  fan motor for 30s successively when the fan motor is operating, indoor fan motor malfunction will be reported. In this case, the unit can automatically resume operation after stopping. If the malfunction occurs 6 times within one hour, the unit cannot  be  recovered  automatically.  Switch  off  the  unit  or re-energize the unit after cutting off power to eliminate this malfunction.

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1  E1 High pressure protection 

High pressure switch 

When outdoor unit detects the high pressure switch is cut off for 3s successively, high pressure protection will occur. All the loads (except the 4 -way valve in heating mode) will be switched off. In this case, all the buttons and remote control signals except ON/OFF button will be disabled and cannot be  recovered  automatically.  Switch  off  the  unit  or re-energize the unit after cutting off power to eliminate this protection.

2  E2 Freeze protection 

Indoor evaporator temperature sensor 

If  detecting  that  the  evaporator  temperature  is  lower  than protective temp. value after the unit has been running for a period of time under cooling or dry mode, the unit will report this  fault,  in  which  case  the  compressor  and  outdoor  fan motor will be stopped. The unit will not run until evaporator temperature  is  higher  than  the  protective  temp.  value  and the compressor is stopped for 3min.

3  E3 Low pressure protection 

Low pressure switch 

If it is detected within 30s successively tha t the low-pressure switch  is  cut  off  under  ON  or  standby  state,  the  unit  will report  low  pressure  protection.  If  the  fault  occurs successively  3  times  within  30min,  the  unit  cannot  be recovered automatically.

Refrigerant lacking protection 

If  the  unit  reports  system  refrigerant  lacking  within  10min after turning on the unit, the unit will stop operation. If the fault  occurs  successively  3  times,  the  unit  cannot  be recovered automatically.

Refrigerant recycling mode 

If  enter  refrigerant  recycling  m ode  through  special operation,  E3  will  be  displayed.  After  exiting  refrigerant recycling mode, the code will disappear.

4  E4 Compressor high discharge temperature protection 

Compressor discharge temperature is high 

If  outdoor  unit  detects  that  the  disch arge  temperature  is higher than protective temp. value, the unit will report high discharge  temperature  protection.  If  the  protection  occurs over  6  times,  the  unit  cannot  be  recovered  automatically. Switch  off  the  unit  or  re-energize  the  unit  after  cutting  off power to eliminate this protection.

6  E6 Communication malfunction 

Communicati on between indoor and outdoor mainboard 

If  the  outdoor  unit  does  not  receive  data  from  indoor  unit, communication  malfunction  will  be  reported.  If  there  is communication abnormity between display board and indoor unit, communication malfunction will be reported too.

8  E8 Malfunction of indoor fan motor 

Indoor fan motor 

If  the  indoor  unit  does  not  receive  signal  from  indoor  fan motor for 30s successively when the fan motor is operating, indoor fan motor malfunction will be reported. In this case, the unit can automatically resume operation after stopping. If the malfunction occurs 6 times within one hour, the unit cannot  be  recovered  automatically.  Switch  off  the  unit  or re-energize the unit after cutting off power to eliminate this malfunction.

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Chuyên mục: C. Bài giảng chuyên ngành Nhiệt Lạnh (Heat and Refrigeration) C. Bài giảng kỹ thuật