Samsung AM072FXVAFH series Service Manual page 178

Troubleshooting
ESC EEV Open error
AM038/048/055KXWD
Outdoor unit display
Indoorunit display
Judgment Method ∙ DSH<10
∙ ESC EEV and Intercooler leakage, excessive refrigerant amount, outdoor check valve inserted opposite.
Cause of problem
∙ Indoor unit EEV leakage, direct connection between Indoor side liquid pipe and the gas pipe.
Indoor unit EEV leakage confirmation (In case it is normal, the EVA In and Out temperatures for the fan operation may rise.)
Operate cooling in one room any of the selected indoor unit. (Remainder indoor unit can confirm simply at the fan operation.)
∙
In case it is normal, the EVA In /Out temperature of indoor unit that is on fan operation within 5 minutes is ascending to value that approaching in
indoor temperature. (Setting as opposed to the indoor unit fan operation and cooling operation functions of the indoor unit, and then check again.)
If cooling operation is operated for low temperature with excessive refrigerant amount, then the DSH may descend.
1. How to check
Is ESC EEV connector accurately connected to PCB?
Check the connection for indoor unit pipe
(Connect liquid pipe-gas pipe directly)
4-82
(cont.)
✳✳
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost Timer Fan
× ×
※ ● : ON ◑ : Flash ×: OFF
, ESC EEV=0step, satisfaction more than 30minutes
℃
Yes
Is EEV coil accurately installed?
Yes
Check the ESC EEV leakage.
Normal
Check the Intercooler leakage.
Normal
Check the indoor unit EEV leakage
Normal
Check the refrigerant amount
Cassette (4/Mini4 Way)
Filter/MPI Operation Defrost Timer
×
No
No
Breakdown
Breakdown
Breakdown
Wall-mounted (NeoForte)
Filter 18℃ 21℃ Turbo
× ×
Reconnect connector
Reassemble the coil
Replace ESC EEV
Replace Intercooler
Replace indoor unit EEV
Reinstall pipe
Samsung Electronics
24℃ 27℃