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6-14
TROUBLESHOOTING THE 24VAC POWER SUPPLY TO THE COMPUTER
Is 24VAC
present across Pins
1 and 2 of the wiring
harness?
Yes
No
24VAC is reaching
computer.
Was there an
audible snap from the
contactor indicating the
coil energized?
No
There is a problem in
the 24VAC Power Supply
System. Refer to the
troubleshooting guide on
Page 6-14.
Did the
computer
activate?
No
Cause is a loose
or broken wire in
the wiring harness.
Yes
Yes
Place the master ON/
OFF switch in the OFF
postion, then back in
the ON postion. Press
the ON/OFF switch on
the computer.