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Troubleshooting Chart
Problem
Possible causes
Operation beyond design conditions.
Voltage range or unbalance.
Compressor thermal
protection switch
High superheat.
open.
Compressor mechanical failure.
Short cycling.
Low oil level.
Insufficient water flow - level too high.
Solenoid valve return oil not open.
Short cycling.
Excess liquid in crankcase - level too high.
Compressor oil level
too high or too low.
Level too high with compressor operation.
Operation or selection of expansion value.
Compressor mechanical problems.
Incorrect oil for application.
Oil collapse in remote piping.
Loose fitting in oil line
The control band is not properly adjusted.
Water temperature sensor failure.
Compressor staging
Insufficient water flow.
intervals too short.
Rapid temperature or flow changes.
Oversized equipment.
Light loads.
Inadequate voltage.
The equipment will
Reset switch is off.
not work.
No water flow in the system.
Water flow is reversed.
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Possible corrective actions
Correct to bring conditions within allowable limits.
Check and correct.
Set correct superheat.
Check for possible problem. Then replace the compressor.
Check and stabilize load or correct control settings for the
application.
Check superheat, if necessary add oil.
Correct the flow, check the superheat.
Check circuit, if necessary replace solenoid valve.
Check and stabilize load and correct control settings for the
application.
Check crankcase heater. Check operation of liquid line solenoid
value.
Confirm superheat is correct, remove oil.
Confirm superheat at minimum and maximum load conditions.
Check for possible problem. Then replace compressor.
Check.
Check refrigerant piping if correction is necessary.
Repair.
Adjust the driver settings for the application.
Replace.
Correct flow.
Stabilize load.
Evaluate equipment selection.
Check and adjust load.
Check the voltage and correct it.
Switch on.
Purge the system.
Check water direction.
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