Samsung AVXCSH023/032/040CE, Service Manual

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Troubleshooting
4-78 Samsung Electronics
4-3-40 : Comp. Down due to a Protective Control of Low Pressure
Indoor unit display
Cause of problem
× (Operation)
◑
(Timer)
◑
(Fan)
◑
(Filter)
×
(Defrost)
• Insufficient refrigerant • Clogged electronically operated valve
• Clogged service valve • Compressor unloading defect
• Defective low pressure sensor
• 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
Criteria
• Detect when the value of low pressure sensor is below 0.25MPa during cooling operation, 0.14MPa during
heating operation
Outdoor unit display
Do the values of S-net and
Manifold gauge correspond?
Does indoor/outdoor EEV oper-
ate well?
Is there any clogged place in
the piping (ex. filter)?
Check the amount of refrigerant
Is there any leakage in
liquid pipe valve or discharge check
valve of the stop-side outdoor unit
when several outdoor units are in
operation?
Test operation
Open the service valve
Replace a low pressure sensor
Check the relevant EEV
Check the piping
Replace the relevant components
Yes
Yes
Yes
No
Are service valves open?
Connect S-net and Manifold gauge
(imperative)
No
No
No
Yes
Yes
1. How to check
No