Samsung AVMKH020EA0 Service Manual page 184

8-2-1. High temperature of discharge sensor
Outdoor unit display
Indoor unit display
Judgment method
Causes
Error reset (Key 3)
Is both service valves open?
Yes
Test operation (key 4)
Are all indoor units
operated normally?
Yes
Is high pressure and
low pressure normal?
Yes
Complete the test operation mode
and check for 1
unit operation
Is all the above check
items normal?
Yes
The system check is completed.
(Operation) (Timer)
- Restart after operation stops when the discharge temperature exceeding 135°C is detected
- System down when two times of detection is made
(count is cleared when no detection is made for one hour)
- Shortage of refrigerant
- Compressor unloading defective (unloading failure)
- Service valve clogged
- Electronic expansion valve clogged
No
No
No
No
- 183 -
(Fan) (Filter) (Removing frost)
Since the service valve is clogged, open
the service valve.
Since it is the electronic expansion valve
close error, check the electronic expansion
valve and PCB related.
Since the refrigerant is insufficient,
check to charge if needed.
No
Is the low pressure
rapidly dropping and the
discharge temperature
increasing?
Since it is the defect of compressor
unloading, check the coil end of PWM
valve. If there is no trouble in the coil,
replace the PWM valve.
Troubleshooting
Yes