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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.
Table 15. Troubleshooting checklist
Problem
No response to any thermostat
setting
Unit short cycles
Insufficient capacity
High pressure switch open
WSHP-SVX02E-EN
Heating Cooling Cause
X
X
Main power off
X
X
Defective control transformer
X
X
Broken or loose connection
X
X
Defective thermostat
X
X
Transformer
X
X
Thermostat or sensor improperly located Relocate
X
X
Low on refrigerant charge
X
X
Restricted thermal expansion valve
X
X
Defective reversing valve
X
X
Thermostat improperly located
X
X
Unit undersized
X
X
Inadequate water flow
X
X
Scaling in heat exchanger
X
Water too hot
X
Water too cold
X
Inadequate GPM
X
Water too hot
X
X
Overcharged with refrigerant
X
X
Defective pressure switch
•
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.
Correction
Check fuses
Replace
Repair
Replace
Reset Transformer
Locate leak, repair and recharge by weight (not
by superheat)
Replace
See WSHP-SVXXX-EN for touch test chart
Relocate
Recalculate heat gains/losses
Increase GPM
Clean or replace
Decrease temperature
Increase temperature
Increase water flow to unit
Decrease temperature
Decrease charge
Check or replace
27
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