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IMPORTANT: The units provide status and
diagnostic information that greatly enhances the abil-
ity to quickly diagnose system faults. Use the follow-
ing troubleshooting guides as another tool in system
diagnostics.
NOTICE: In diagnosing common faults in the
cooling system, develop a logical thought pattern as
used by experienced technicians. The charts which fol-
low are not intended to be an answer to all problems but
only to guide the technicianʼs trouble shooting. Through
a series of yes and no answers, follow the logical path
to a likely conclusion.
A novice technician should use these charts like a road
map. Remember that the chart should clarify a logical
path to the solution.
No
No
Alt Flash
Other Fault
No
Yes
Yes
Yes
Unit Running?
Control Voltage powering
Red LEDʼs on?
Dual LED
See diagnostic label on
control.
Short cycle delay is active.
Test short pins will override
delay.
Go to Mechanical check for cooling
Check indoor
transformer/Fuse/
Wiring/Connections
Check thermostat/24 VAC
on Y Terminal
Thermostat calling, but unit not cooling
ELECTRICAL CHECKS FLOW CHART
TROUBLESHOOTING
Troubleshooting
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