Electric Oven Service Manual

40 TROUBLESHOOTING
Is the output of the burner
transformer 24 VAC (page
28)?
Troubleshooting:
F10: Air Pressure Switch Fault
Are all the contacts
on the high limit
thermostat closed?
Does the burner trans-
former have line voltage
applied to input
(208-240 VAC)?
YES
Replace the burner
transformer
(page A-8).
NO
Investigate the reason for
the high limit tripping. If
the thermostat is defective,
replace it (page A-14).
Is the air pressure
switch closed?
YES
YES
NO
NO
YES
Is the wiring
correct
(page 45)?
NO
YES
NO
Correct wiring
(page 45).
Replace the
I/O control
board
(page A-8).
YES
NO
Is the air tube
connected tightly?
YES
NO
Replace the
air tube.
Replace the
air switch
(page A-14).
Is line voltage
applied (208-240
VAC) to the
BMSC (page 25)?
YES
NO
Check the
wiring
(page 45).
Replace the
combustion
blower
(page A-14).
Are the K3 relay
contacts closed?
YES
Check the
wiring (page 45).
NO
Is coil voltage
(24 VDC)
applied to the
K3 relay (page
22)?
NO
YES
Replace the I/O
control board
(page A-8).
Replace the K3
relay (page A-8).
Is the combustion
blower running?