WSHP-SVX02E-EN
27
Troubleshooting
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
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 perform these
tasks.
Preliminary Trouble Inspection
If operational difficulties are encountered, be sure to
perform the preliminary checks before referring to the
troubleshooting chart below.
•
Verify that the unit is receiving electric supply power.
•
Ensure that the fuses in the fused disconnect (field
installed) are intact.
After completing the preliminary checks, inspect the unit
for other obvious problems such as leaking connection,
broken or disconnected wires, etc. If everything appears to
be in order, but the unit still fails to operate properly, refer
to the troubleshooting chart below.
General Operation
The standard model is designed for indoor installation.
When the unit is installed in an unconditioned space, the
unit may not start in cool weather (approximately 45°F). It
may then be necessary to start the unit in the cooling mode
for three to five minutes. The unit may then be shut-off
(there will be a two minute time-out of the unit), and
restarted in the heating mode. The freeze protection
thermostat should also be checked as it may be adversely
affected by ambient temperature.
Like any other type of mechanical equipment, the unit
performs best when it is well maintained.
Table 15. Troubleshooting checklist
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
Insufficient capacity
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-SVXXX-EN 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
X
Overcharged with refrigerant
Decrease charge
X
X
Defective pressure switch
Check or replace
