Transfer Switch Failure - Briggs & Stratton 040298 Service & Troubleshooting Manual

Transfer switch fault monitoring is an optional feature
of the Home Generator System. A transfer switch with
a compatible Air Conditioning Control Module (ACCM
II or later) is required for this feature. This module
monitors the transfer switch circuits during normal
utility power and during standby power. Not all transfer
switches will have ACCM II.
A transfer switch fault indicates an open circuit within
the switch, which can occur:
• at the fuse(s)
• in the contactor coils
• in the limit switches
• in the factory wiring
Because 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 wiring diagram specific to the model of transfer
switch installed.
The most common cause of transfer switch problems
is a blown transfer switch fuse.
When a transfer switch fault occurs, the digital display
will show FC_8 and the remote LED will repeatedly
flash eight times with a pause.
• The fault code will display if a fault occurs
while the unit is stopped and set in AUTO
mode.
• The FC_8 fault code will not display if a fault
occurs while the unit is running in
EXERCISE, MANUAL, or UTILITY mode.
• The fault code will display if a fault occurs
while the unit is stopped and set in AUTO
mode.
• The unit will not shut down if a fault occurs
while the unit is delivering standby power.
But the fault code will display when power
transfers back to the utility and the
generator has stopped running.
(FC_8) TRANSFER SWITCH FAILURE
2
2
53