Troubleshooting Table - Trane GEHE Installation And Maintenance Manual

Table 60. Troubleshooting table
Problem
No response to any
thermostat setting
Unit short cycles
Blower runs, but compressor
does not
Insufficient capacity
High pressure switch open
High head pressure
Low suction pressure
Low pressure switch open
WSHP-SVX01L-EN
Heating Cooling
X X
X X Defective control transformer
X X Broken or loose connection
X X
X X
X X Thermostat or sensor improperly located
X X Defective compressor overload
X X Defective compressor contactor
X X
X X Defective compressor capacitor
X X
X X
X X
X X
Loss of conditioned air due to leaks in
X X
X Introduction of excessively hot return-air
X Introduction of excessively cold return-air
X X Low on refrigerant charge
X X Restricted thermal expansion valve
X X Defective reversing valve
X X Thermostat improperly located
X X
X X
X X Scaling in heat exchanger
X
X
X X
X X Defective reversing valve
X
X
X
X
X X Overcharged with refrigerant
X X Defective pressure switch
X
X
X X Overcharge of refrigerant
X X Non-condensable in system
X X
X
X
X X
X X Restricted thermal expansion valve
X
X
X
X
X
X
X
X X Undercharged with refrigerant
X X Defective pressure switch
X X Heat transfer fluid too cold
Cause
Main power off
Defective thermostat
Transformer
Supply Voltage too low
Defective windings
Limit switches open
Dirty filter
Blower RPM too low
ductwork
Unit undersized
Inadequate water flow
Water too hot
Water too cold
Filter drier blocked
Inadequate GPM
Water too hot
Inadequate air flow
Dirty filter
Trash in heat exchanger
Low water flow
Water too hot
Dirty filter
Inadequate air flow
Undercharged
Inadequate air flow
Dirty filter
Inadequate GPM
Inadequate GPM
Water too cold
Inadequate air flow
Dirty filter
Troubleshooting
Correction
Check fuses
Replace
Repair
Replace
Reset Transformer
Relocate
Replace (if external)
Replace
Correct
Replace
Replace
Check cause/Replace or repair
Replace/clean
Correct
Repair leaks
Correct
Correct
Locate leak, repair and recharge by
weight (not by superheat)
Replace
See WSHP-IOM-# for touch test chart
Relocate
Recalculate heat gains/losses
Increase GPM
Clean or replace
Decrease temperature
Increase temperature
Replace
Check or replace
Increase water flow to unit
Decrease temperature
Check, clean blower and coil
Clean/replace
Decrease charge
Check or replace
Backflush
Increase GPM
Decrease charge
Evacuate and recharge by weight
Decrease temperature
Clean / replace
Check, clean blower and coil
Locate leak, repair and recharge
Repair / replace
Check, clean blower and coil
Clean/replace
Increase GPM
Increase GPM
Increase temperature
Increase CFM
Clean/replace
Increase charge
Replace
Raise water temperature
103