Comp. Down Due To A Protective Control Of Low Pressure - Samsung AVXCSH023/032/040CE Service Manual

Troubleshooting
4-3-40

: Comp. Down due to a Protective Control of Low Pressure

Outdoor unit display
(Operation)
Indoor unit display
• Detect when the value of low pressure sensor is below 0.25MPa during cooling operation, 0.14MPa during
Criteria
heating operation
• Insufficient refrigerant
• Clogged service valve
• Defective low pressure sensor
Cause of problem
• Leakage in discharge check valve of the compressor in the stop-side outdoor unit
• When used in a temperature condition that does not fall within the usage condition
(outdoor air temperature during heating operation –below 68˚F/20˚C, outdoor air temperature during
cooling operation – below 23˚F/-5˚C), this error may occur
1. How to check
Are service valves open?
Do the values of S-net and
Manifold gauge correspond?
Does indoor/outdoor EEV oper-
Is there any clogged place in
the piping (ex. filter)?
Is there any leakage in
liquid pipe valve or discharge check
valve of the stop-side outdoor unit
when several outdoor units are in
Check the amount of refrigerant
4-78
(Timer) (Fan)
• Clogged electronically operated valve
• Compressor unloading defect
Test operation
Yes
Yes
ate well?
Yes
No
operation?
No
(Filter) (Defrost)
Connect S-net and Manifold gauge
No
Open the service valve
No
Replace a low pressure sensor
No
Check the relevant EEV
Yes
Yes
Replace the relevant components
(imperative)
Check the piping
Samsung Electronics