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Trouble Shooting Guide
Before troubleshooting this system, read this manual to determine electrical power and
installation requirements to allow the spot cooler to perform at its maximum efficiency. Refer to
general description, wiring diagrams and photographs to get an understanding of how the unit
functions.
Service other than routine maintenance should be performed only by a qualified
refrigeration service person.
GENERAL TROUBLESHOOTING
Problem
Possible Cause
Remedy
Entire unit does not operate.
1 Power interruption.
1 Check external power supply for tripped breaker or blown fuse.
Check reset button on power cord.
2 Defective tank full unit cutout switch
2 Check and replace.
3 Condensate tank could be full.
3 Check tank and empty if necessary.
4 Unit keypad control setting may be too
high.
4 Lower
setting.
5 Return air sensor out of calibration or
defective.
5 Replace if error message ES is displayed on keypad.
6 No control voltage 24VAC on transformer
secondary.
6 Check and replace.
Insufficient cooling.
1 Improper sizing of unit.
1 Check if the unit is undersized for the load. Add supplemental
unit(s).
2 Dirty air filter in unit.
2 Clean filter
3 Dirty evaporator coil.
3 Clean evaporator coil.
4 Ice on evaporator coil.
4 Defrost; use fan only operation.
5 Obstructed intake.
5 Remove obstruction.
6 Other possible causes.
6 Refer to condenser, evaporator and compressor sections.
7 Low voltage.
7 Check supply power. Must be within 10% of nameplate rating.
8 Condenser coil dirty or restricted.
8 Replace condenser coil.
9 Thermostat set too high.
9 Lower setting.
10 Water bypass valve closed or not operating
or restricted.
10 Adjust, clear restriction or replace.
11 Reversing valve stuck open in heating
mode. Solenoid coil not switching valve to
cooling.
11 Verify that no power is applied to the reversing valve solenoid
coil. If the valve is not powered and the leaving air temperature
from the evaporator coil is hot when the compressor is running,
recover refrigerant, replace reversing valve, install filter/dryer,
evacuate system and weigh in proper charge.
12 Unit not set for heating or cooling.
12 Refer to Unit Operation section.
13 Defective wiring or connection.
13 Tug on wires to see if they will separate from connections.
14 Restriction in refrigerant system.
14 Restriction can be located by inspecting refrigerant line for
temperature changes. Recover refrigerant, remove restriction,
install filter/dryer, evacuate system and weigh in proper charge.
15 Water temperature too high or too low.
15 Water Out temperature must not exceed 110°F or fall below
50°F. Check inlet water temperature for extremes. Adjust valve.
16 Water to unit not turned on, not adjusted
correctly or low inlet water pressure.
16 Turn water on before starting unit. Adjust flow rate as necessary.
Minimum inlet water pressure can be found in the Specification
and Electrical Data section..