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18.3 Electrical Checks Flow Chart
Thermostat call
For cooling, no cooling
Outdoor Unit
Running?
No
7-Segment display lit?
Yes
Y1 LED lit?
Yes
Flashing Mode Character
Yes
Alternating "C" and "##" (Code)
Yes
SEE PANEL COVER OR
OTHER DOCUMENTATION
FOR FAULT CODE
TROUBLESHOOTING.
Yes
Refer to panel cover/documentation
for Fault Code Troubleshooting.
Check fault history for other faults.
No
Check control voltage (R and C)
to control
No
No call received.
24V Systems: Check thermostat,
control wiring
Comm Systems: Check comm.
wiring, T-Stat
No
Waiting for Anti-S.C. Delay to clear
Note: For solid comm LED, check
comm wiring, term/bus switches at
ICC and AH ctrls.
No
Control in Lockout Mode.
Check fault history and refer to
Diagnostic Chart.
45
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Table of Contents
Troubleshooting
