Samsung AVMKH020EA4 Service Manual page 215

Troubleshooting
The 1 st , 2 st error of indoor EEV closing (cont.)
4) In main heating mode (Every condition below should be satisfied 20 minutes over.)
Tcond, out - Tair, out > 2˚C
Tair, in - Teva, in ≥ 4˚C
Tair, in - Teva, out ≥ 4˚C
Compressor running &
indoor unit on and thermo on
Liquid Bypass switches ON because of the raise of
compressor discharge temperature.
T > 50˚C
MCU Temp.
Teva, in - Tair, in ≥ 3˚C
Teva, out - Tair, in ≥ 2˚C
Average of high pressure > 15kg/cm
Average of low pressure < 5kg/cm
2. Check method
1) Check if the EEV wire is connected with indoor PCB correctly.
2) Check if the EEV coil is inserted into the main body.
3) Check if the same error is occurred after pressing the reset key(K3) of outdoor unit. Operate the related indoor unit.
4) If there is no abnormal with above check items, replace the EEV of the related indoor unit. Be sure to check above items
before the replacement of EEV because the replacement of EEV is a hard work to collect refrigerant of total in the system.
11-29
Cooling Indoor unit
2
2
Heating Indoor unit
OK
NO
NO
OK
OK
Samsung Electronics
OK
OK
OK
Not related
NO
NO
OK
OK