Thermal Care NQA13 - General Troubleshooting

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General Troubleshooting
Problem
Possible Cause
Remedy
Compressor will not
start
Compressor overload
Check supply voltage, amperage of each leg,
contactor and wiring, and overload set point
Compressor contactor
Replace if faulty
Compressor failure
Contact Customer Service for assistance
Pump will not start
Pump overload
Check supply voltage, amperage of each leg,
contactor and wiring, and overload set point
Pump contactor
Replace if faulty
Pump failure
Replace if faulty
Low refrigerant
pressure
Low refrigerant charge
Contact refrigeration service technician
Refrigerant leak
Contact refrigeration service technician
Low refrigeration pressure sensor
Check for proper range, replace if faulty
High refrigerant
pressure
Dirty air filters (air-cooled units only)
Clean filters
Air flow obstruction (air-cooled units only)
Make sure chiller is installed in accordance
with recommendations in this manual
High ambient air temperature (air-cooled units only)
Ambient temperature must be reduced below
110°F
Condenser fan motor (air-cooled units only)
Replace if faulty
Condenser fan cycling control (air-cooled units only)
Confirm proper operation, replace if faulty
Plugged condenser (water-cooled units only)
Clean out tubes
Insufficient condenser water flow (water-cooled units
only)
Make sure chiller is installed in accordance
with the recommendations of this manual
High condenser water temperature (water-cooled
units only)
Condenser water temperature must be
reduced below 100°F
Condenser water regulating valve
Check setting, replace if faulty
Refrigerant circuit overcharged
Contact refrigeration service technician
High refrigerant pressure sensor
Replace if faulty
Freezestat
Low flow through evaporator
Adjust flow to proper level
Freezestat control module
Check for proper setting (Protected Setting)
Freezestat sensor
Replace if faulty
Low pump discharge
pressure
Pump running backwards
Switch 2 legs of the incoming power
Pump pressure gauge
Replace if faulty
Pump failure
Replace if faulty
Excessive flow
Reduce flow
High pump discharge
pressure
Closed valves in process piping
Open valves
Obstruction in piping or process
Remove obstruction
Clogged Y-strainer
Clean strainer
Pressure gauge
Replace if faulty