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84 WSHP-SVX01D-EN
WARNING
Hazardous Service Procedures!
The maintenance and trouble shooting procedures recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these procedures. When possible, disconnect all electrical pow-
er including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized. When necessary to work with live electrical components, have a
qualified licensed electrician or other individual who has been trained in handling live electrical components
per these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or
serious injury.
Problem Heating Cooling Cause Correction
No response to any
thermostat setting
X X Main power off Check fuses
X X Defective control transformer Replace
X X Broken or loose connection Repair
X X Defective thermostat Replace
X X Transformer Reset Transformer
Unit short cycles X X Thermostat or sensor improperly located Relocate
Blower runs, but compressor does not
X X Defective compressor overload Replace (if external)
X X Defective compressor contactor Replace
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
Insufficient capacity
X X Dirty filter Replace/clean
X X Blower RPM too low Correct
X X
Loss of conditioned air due to leaks in
ductwork
Repair leaks
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)
X X Restricted thermal expansion valve Replace
X X Defective reversing valve See WSHP-IOM-# for touch test chart
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
High pressure switch open
X Inadequate GPM Increase water flow to unit
X Water too hot Decrease temperature
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
Troubleshooting
Checklist