Troubleshooting; General Unit Troubleshooting - Trane Axiom VSHE024 Operating And Maintenance

Troubleshooting

Hazardous Service Procedures!
The maintenance and troubleshooting 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 power 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.

General Unit Troubleshooting

Problem
No response to any zone sensor
setting
Unit short cycles
Blower runs but compressor does not
Insufficient capacity
High pressure switch open
1
Variable speed compressors sound different than single speed compressors. The compressor sound will change as the speed and operating conditions change.
60
WARNING
1
Heating Cooling
X X
X X
X X
X X
X X
X X Zone sensor improperly located
X X
X X
X X
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
X X Restricted thermal expansion valve
X X Zone sensor improperly located
X X
X X
X X
X
X
X X
X X
X
X
X
X
X X
X X
Cause
Main power off
Defective control transformer
Broken or loose connection
Defective zone sensor
Transformer
Supply Voltage too low
Defective windings
Limit switches open
Zones sensor error
Compressor drive error
Dirty filter
Blower RPM too low
ductwork
Low on refrigerant charge
Unit undersized
Inadequate water flow
Scaling in heat exchanger
Water too hot
Water too cold
Filter drier blocked
Defective reversing valve
Inadequate GPM
Water too hot
Inadequate air flow
Dirty filter
Overcharged with refrigerant
Defective pressure switch
Correction
Check fuses
Replace
Repair
Replace
Reset Transformer
Relocate
Correct
Replace
Check cause/replace or repair
Check cause/replace or repair
Check cause/replace or repair
Replace/clean
Correct
Repair leaks
Correct
Correct
Locate leak, repair and recharge by
weight (not by superheat)
Replace
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
WSHP-SVX13C-EN