Trane WPHF, WPVJ manual Troubleshooting Checklist, Unit short cycles

Troubleshooting

Checklist

Problem	Heating	Cooling	Cause	Correction
	X	X	Main power off	Check fuses
No response to any	X	X	Defective control transformer	Replace
	X	X	Broken or loose connection	Repair
thermostat setting
	X	X	Defective thermostat	Replace
	X	X	Transformer	Reset Transformer
Unit short cycles	X	X	Thermostat or sensor improperly located	Relocate
	X	X	Defective compressor overload	Replace (if external)
	X	X	Defective compressor contactor	Replace
Blower runs, but compressor does not	X	X	Supply Voltage too low	Correct
	X	X	Defective compressor capacitor	Replace
	X	X	Defective windings	Replace
	X	X	Limit switches open	Check cause/Replace or repair
	X	X	Dirty filter	Replace/clean
	X	X	Blower RPM too low	Correct
	X	X	Loss of conditioned air due to leaks in	Repair leaks
			ductwork
		X	Introduction of excessively hot return-air	Correct
	X		Introduction of excessively cold return-air	Correct
	X	X	Low on refrigerant charge	Locate leak, repair and recharge by
				weight (not by superheat)
Insufficient capacity
	X	X	Restricted thermal expansion valve	Replace
	X	X	Defective reversing valve	Replace
	X	X	Thermostat improperly located	Relocate
	X	X	Unit undersized	Recalculate heat gains/losses
	X	X	Inadequate water flow	Increase GPM
	X	X	Scaling in heat exchanger	Clean or replace
		X	Water too hot	Decrease temperature
	X		Water too cold	Increase temperature
		X	Inadequate GPM	Increase water flow to unit
		X	Water too hot	Decrease temperature
High pressure switch open	X		Inadequate air flow	Check, clean blower and coil
	X		Dirty filter	Clean/replace
	X	X	Overcharged with refrigerant	Decrease charge
	X	X	Defective pressure switch	Check or replace
		X	Trash in heat exchanger	Backflush
		X	Low water flow	Increase GPM
High head pressure	X	X	Overcharge of refrigerant	Decrease charge
	X	X	Non-condensable in system	Evacuate and recharge by weight
	X	X	Water too hot	Decrease temperature
	X		Dirty filter	Clean / replace
	X		Inadequate air flow	Check, clean blower and coil
	X	X	Undercharged	Locate leak, repair and recharge
Low suction pressure	X	X	Restricted thermal expansion valve	Repair / replace
		X	Inadequate air flow	Check, clean blower and coil
		X	Dirty filter	Clean/replace
	X		Inadequate GPM	Increase GPM
	X		Inadequate GPM	Increase GPM
	X		Water too cold	Increase temperature
Low Pressure switch open		X	Inadequate air flow	Increase CFM
		X	Dirty filter	Clean/replace
	X	X	Undercharged with refrigerant	Increase charge
	X	X	Defective pressure switch	Replace
	X	X	Heat transfer fluid too cold	Raise water temperature

34 WSHP-SVX04A-EN