46
18. Trouble shooting
Problem
Probable cause Solution
Unit operates
continuously
but without
generating
cooling
Insuffi cient refrigerant fl uid charge. Top up the refrigerant fl uid charge.
Clogged dehumidifi cation fi lter. Replace the dehumidifi cation fi lter.
Reduced output from one or both circuits
Check the compressor valves and change them if
necessary.
Frozen intake line
The overheating setting on the thermostatic
pressure relief valve is set too low.
Increase the setting.
Check the refrigerant fl uid charge
Excessive noise
Vibrating pipe work
Attach the pipe work correctly.
Check the pipe work attachments.
Whistling noise from the thermostatic pressure
relief valve
Top up the refrigerant fl uid charge.
Check and replace the dehumidifi cation fi lter if
necessary.
Noisy compressor
Check the condition of the valves.
Seized bearings. Replace the compressor
Check the tightness of the compressor attachment
nuts.
Low oil level in
the compressor
Presence of one or several oil or gas leaks in the
circuit
Locate and repair the leaks
Mechanical compressor damage. Contact an approved Service Centre.
Sump oil heater resistance fault.
Check the electrical circuit and the condition of the
resistance. Replace defective parts if necessary.
One or both
compressors do
not operate.
Electrical circuit cut.
Check the electrical circuit and seek out any
grounding and/or short- -circuits. Check the fuses.
High pressure pressostat activated.
Reset the pressostat from the control panel and
restart the unit. Identify and eliminate the causes of
this activation.
Control circuit fuse blown.
Check the control circuit and seek out any
grounding and/or short-circuits. Replace the fuses.
Connection problem
Check the tightness of all the electrical connection
terminals.
Electrical circuits thermal protection cuts in.
Check the operation of the control and safety
devices. Identify and eliminate the cause of the
activation.
Incorrect wiring. Check the wiring of the control and safety devices.
Mains voltage too low.
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.
Compressor motor short–circuited. Check the continuity of the motor winding.
Compressor seized Replace the compressor.
Circuit stoppage
further to the
low pressure
thermostat being
activated.
Presence of a leak. Identify and repair the leak.
Insuffi cient refrigerant fl uid charge. Top up the refrigerant fl uid charge.
Pressostat operating fault. Replace the pressostat.
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