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Troubleshooting
Table 15. Troubleshooting checklist (continued)
Problem
High head pressure
Low suction pressure
Low Pressure switch open
Freezestat open
28
Heating Cooling Cause
X
Trash in heat exchanger
X
Low water flow
X
X
Overcharge of refrigerant
X
X
Non-condensable in system
X
X
Water too hot
X
X
Undercharged
X
X
Restricted thermal expansion valve
X
Inadequate GPM
X
Inadequate GPM
X
Water too cold
X
X
Undercharged with refrigerant
X
X
Defective pressure switch
X
X
Heat transfer fluid too cold
X
Inadequate GPM
X
Water too cold
X
X
Defective freezestat
X
Heat transfer fluid too cold
Correction
Backflush
Increase GPM
Decrease charge
Evacuate and recharge by weight
Decrease temperature
Locate leak, repair and recharge
Repair / replace
Increase GPM
Increase GPM
Increase temperature
Increase charge
Replace
Raise water temperature
Increase GPM
Increase GPM
Replace freezestat
Replace freezestat
WSHP-SVX02E-EN
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