Product Manual

Troubleshooting Guide
S
ervice, other than routine maintenance, should be performed by a qualified electrical and refrigeration professional.
P
roblem Cause Remedy
Unit does not run Power interruption Check external power supply. Look for blown
fuses or tripped circuit breakers. Reset or replace.
Thermostat inoperable Setting may be too high. Check and reset.
Thermostat may be out of calibration or
defective. Replace.
Electrical Panel Check output of transformer.
-24-Volt transformer defective (TZ-12AB, 18AB, If not supplying 24 volts, replace.
24AB, 36AB and 60AB only)
-Contactor coil defective Replace.
-Contacts stuck open, burned or dirty Correct or change.
-Wires loose Tighten connections.
Evaporator fan runs, Low voltage Check power supply for voltage outside
but compressor and the range of 106 to 126-V on 115-V
condenser fan does units and 187 to 253-V 208/230- V units.
not start
Thermostat Examine control unit for loose wires and
tighten. Wait four minutes before re-starting.
High-pressure control switch Clean condenser coil filter.
turning unit off Clean condenser discharge screen.
Check for defective condenser fan motor.
Replace if necessary.
Restricted duct.
Short cycle timer not timed out (TZ-12A, 18AB, Wait 5 min for timer to allow compressor to restart.
24AB, 36AB, and 60AB only)
Compressor contactor open or burned Replace.
Refrigerant leak - no freon Locate leak and repair. Evacuate unit
and recharge.
Loose or defective wires, Check for loose or shorted conductors. Secure
contact between wires and connectors. Repair
or replace as necessary.
Defective compressor Check for shorts, opens, and grounds.
Compressor replacement should be done by a
service technician.
Condensate tank-full Empty tank and replace.
(See pg. 5 - condensate tank)
Red indicator light defective Check tank, if full, remove tank, empty and
replace. If unit comes back on replace defective
light. (See pg. 10)
Shorted or open run capacitor(s) Replace.
Condensate jumper plug or condensate Unit must have either condensate pump
pump not installed or condensate jump plug installed to
operate unit.
Compressor runs, Open fan motor coil circuit Replace fan motor.
but fan does not run
Shorted or open fan-motor capacitor Replace capacitor.
Loose or defective wires Trace and repair.
Overload relay tripped (TZ-60AB only) Open rear access cover, push in red manual
reset button on overload relay, wait 5 min for
compressor to restart.
TOPAZ
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Owner’s Manual