Troubleshooting
62
Samsung Electronics
4-4-13
: EEV(Electronic Expansion Valve) closure malfunction (2nd stage)
1. How to diagnose
1) During Cooling operation. (Each of the below conditions have to be met for at least 20 minutes.)
Tcond,out - Tair,out > 3
℃
OK
Tair,in - Teva,in > 4
℃
NO
Tair,in - Teva,out > 4
℃
NO
Compressor in operation & Indoor unit operation & Thermo ON
OK
Error details
Indoor Unit EEV closure breakdown
2) During heating operation (must satisfy all conditions below)
∙ When more than 2 indoor units are on Thermo ON heating operation.
∙ When average high pressure is over 18kg/cm
2.
5 minutes after finishing Safety Start .
∙ Keep Indoor Unit T(Eva_In) < T(Room) + 3˚C and T(Eva_Out)<T(Room) + 3˚C condition for more than 5 minutes.
2. How to check
No
Connect to PCB and
restart operation.
No
Connect the EEV coil properly
and restart operation.
Yes
Replace EEV coil
No
Normal operation of EEV.
Is the EEV wire connected to the PCB?
Is the EEV coil connected to
the main body properly?
After measuring
the coil terminal resistance, is there a
disconnection or short circuit inside
the coil?
After Resetting
the Outdoor Unit, does an error occur even after
running it again with the same
combination?
Replace EEV coil.
Yes
Yes
No
Yes
Outdoor unit display
1st detection : P702 (Outdoor Unit display only)
2nd detection :
x x x ( x x x : The address of the error occurred indoor unit )
Indoor unit display
Criteria
• Refer to the judgment method below.
Cause of problem
• Faulty Indoor Unit EEV action. (EEV does not open.)
