58
2
(FC_8)
TRANSFER SWITCH FAILURE
A transfer switch with a compatible Air
Conditioning Control Module (ACCM III or later
version) is required for this feature to function.
This module monitors the transfer switch during
normal utility power and during standby power.
Not all transfer switches will have this feature.
A transfer switch failure indicates an open circuit
within the switch, which can occur:
• at the fuse(s)
• in the contactor coils
• in the limit switches
• at the utility fuse(s) in the transfer
switch or generator
• utility sensing wiring not connected to
generator
Because of wiring and connections, an open
circuit can occur in variable places, generator
symptoms may vary. A visual inspection is
generally sufficient to determine the source.
Further troubleshooting can be done with a
continuity tester and a wiring diagram specific to
the model of transfer switch installed.
NOTE: Most common cause of transfer switch
failures is a blown transfer switch fuse.
When a transfer switch failure occurs, the digital
display will show FC_8 and the remote LED will
repeatedly flash eight times with a pause.
The FC_8 fail code will not display if a failure
occurs while the unit is running in EXERCISE,
MANUAL, or UTILITY mode.
• The fail code will display if a failure
occurs while the unit is stopped and set
in AUTO mode.
• The unit will not shut down if a failure
occurs while the unit is delivering
standby power. But the fail code will
display when power transfers back to
the utility.
WARNING
Battery posts, terminals, and related
accessories contain lead and lead
components, chemicals known to the State
of California to cause cancer and
reproductive harm. Wash hands after
handling.
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