SERVICING
S-10A Copeland Comfort Alert™ -
Unitary (UC) Control Diagnostics
Applies to DX16TC, DX18TC, DZ16TC, DZ18TC models
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
The Copeland Comfort AlertTM diagnostics are fully integrated
into the unitary (UC) control. The UC control and integraged
Comfort Alert™ diagnostics provide around-the-clock monitor-
ing for common electrical problems, compressor defects and
broad system faults. If a problem is detected, LED indicators
flash the proper alert codes to help you quickly pinpoint the
problem.
The diagnostic tables on following pages provide detailed
information regarding the system symptons, indicators (LED
and thermostat), potential problem(s), and corrective actions.
The diagnostic information applies to systems wired as 24VAC
traditional (legacy) systems and systems wired as communicat-
ing systems with the CTK0* communicating thermostat.
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