Trouble Shooting - Panasonic 140 Installation And Maintenance Manual

18. Trouble shooting

Problem Probable cause
Insuffi cient refrigerant fl uid charge.
Unit operates
continuously
but without Clogged dehumidifi cation fi lter.
generating
cooling
Reduced output from one or both circuits
Frozen intake line The overheating setting on the thermostatic
pressure relief valve is set too low.
Vibrating pipe work
Whistling noise from the thermostatic pressure
relief valve
Excessive noise
Noisy compressor
Presence of one or several oil or gas leaks in the
circuit
Low oil level in
Mechanical compressor damage.
the compressor
Sump oil heater resistance fault.
Electrical circuit cut.
High pressure pressostat activated.
Control circuit fuse blown.
Connection problem
One or both
Electrical circuits thermal protection cuts in.
compressors do
not operate.
Incorrect wiring.
Mains voltage too low.
Compressor motor short–circuited.
Compressor seized
Presence of a leak.
Circuit stoppage
further to the
low pressure Insuffi cient refrigerant fl uid charge.
thermostat being
activated.
Pressostat operating fault.
Solution
Top up the refrigerant fl uid charge.
Replace the dehumidifi cation fi lter.
Check the compressor valves and change them if
necessary.
Increase the setting.
Check the refrigerant fl uid charge
Attach the pipe work correctly.
Check the pipe work attachments.
Top up the refrigerant fl uid charge.
Check and replace the dehumidifi cation fi lter if
necessary.
Check the condition of the valves.
Seized bearings. Replace the compressor
Check the tightness of the compressor attachment
nuts.
Locate and repair the leaks
Contact an approved Service Centre.
Check the electrical circuit and the condition of the
resistance. Replace defective parts if necessary.
Check the electrical circuit and seek out any
grounding and/or short- -circuits. Check the fuses.
Reset the pressostat from the control panel and
restart the unit. Identify and eliminate the causes of
this activation.
Check the control circuit and seek out any
grounding and/or short-circuits. Replace the fuses.
Check the tightness of all the electrical connection
terminals.
Check the operation of the control and safety
devices. Identify and eliminate the cause of the
activation.
Check the wiring of the control and safety devices.
Check the power line. Eliminate any possible
problems associated with the system. If the
problem is due to the network, inform the Electricity
Supply Company.
Check the continuity of the motor winding.
Replace the compressor.
Identify and repair the leak.
Top up the refrigerant fl uid charge.
Replace the pressostat.
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