Samsung AVMKH020EA0 Service Manual page 208

8-2-28. Electronic expansion valve close error
Outdoor unit display
Indoor unit display
Judgment method
Causes
1. Judgment method
1) In cooling mode (The following conditions shall be satisfied for more than 20 minutes)
Tcond, mid-Tair, out > 3°C
Tcond, out - Tair, out > 3°C
Tair, in - Teva, in > 4°C
Tair, in - Teva, out > 4°C
Compressor operating &
indoor unit operating and thermo on
Error contents
2) In heating mode (All following conditions should be satisfied)
2) (1) More than 2 indoor units are operating in THEMO ON heating mode.
2) (2) Average of high pressure is more than 18kg/cm
2) (3) 5 minutes after completion of the safety start.
2) (4) The condition of 'indoor unit T(EVAP_in) < T(room)+3°C and T(EVAP_out) < T(room)+3°C' is maintained for 5 minutes.
2. Check method
1) Check whether the electronic expansion valve wire is connected correctly to the indoor unit PCB.
2) Open the electronic expansion valve kit to check whether the electronic expansion valve coil is correctly inserted.
3) Press the reset key (K3) of outdoor unit to check whether the same error appears.
2) - If it is the close error, operate the related indoor unit.
2) - If it is open error, put the related power off to check.
4) If there is no trouble for the above check items, replace the electronic expansion valve.
2) - Since the replacement of electronic expansion valve is the inconvenient work to recover the all refrigerant in the system,
be sure to check the above items before replacing it.
x
(Close error of xth electronic expansion valve)
(Operation) (Timer)
- Refer to the following judgment method
- Indoor unit electronic expansion valve close error
.
2
- 207 -
(Fan) (Filter) (Removing frost)
Electronic expansion valve close error
Troubleshooting
OK
OK
NO
OK
OK