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Lower Bake Element Does Not Work
Enter the service mode and turn
on the lower bake element.
Is the lower bake element on?
No
Disconnect the lower bake
element. Is 240 VAC present
from the LORB relay K121
COM to K17 NO contacts?
Yes
Is -14.0 VDC present from
the MLB connectors J4,
pin 7 to J5, pin 2?
Yes
Is -14.0 VDC present from
the LORB connectors J9,
pin 7 to MLB J3, pin 2?
Repair the faulty
wiring from the
MLB and LORB.
NoYes
Replace
the LORB.
Is 240 VAC present
at the lower bake
element connectors?
Replace the lower
bake element.
Repair the faulty wiring from the
LORB to the lower bake element.
Yes
No
Yes
No
Is 4.6 VDC present from
the MLB connectors J4,
pin 5 to J5, pin 2?
No
Replace
the MLB.
Yes
Is 4.6 VDC present from the
LORB connectors J9, pin 5
to MLB J5, pin 2?
No
Yes
Repair the faulty
wiring from the
MLB to LORB.
Replace
the LORB.
Is 240 VAC present from
the LORB relay K121 COM
contact to K17 COM?
No
Is 240 VAC
present from the
LORB relay K121
COM contact to
K14 NC?
Repair the faulty
wiring from the LORB
relay K20 Com to K17
NC contacts.
Yes
Is 240 VAC present from
the LORB relay K121 COM
contact to K14 COM?
Yes
Is -14.0 VDC present
from the MLB connectors
J4, pin 4 to J5, pin 2?
No
Replace
the MLB.
Yes
Is -14.0 VDC present from
the LORB connectors J9,
pin 4 to MLB J5, pin 2?
No
Yes
Repair the faulty
wiring from the
MLB to LORB.
Replace
the LORB.
No
Is 240 VAC present from
the LORB relay K121 COM
contact to K14 COM?
Replace R2 or repair
the faulty wiring from
the L1 or L2 input.
No
Yes
No
No
Replace
the MLB.
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