28 DIAGNOSING AN ISSUE
TO FROM DESCRIPTION EXPECTED RESISTANCE
Black Red Winding (A-B) 2.0-2.6 Ohms
Black White Winding (A-C) 2.0-2.6 Ohms
Red White Winding (B-C) 2.0-2.6 Ohms
Black, Red or White Green Windings to Chassis Open
Figure 30: Motor Windings Resistance Table
Troubleshooting:
F1: BLOWER (Blower Running Status Bad)
YES
YES
NO
Check the wire harness and
if necessary, replace blower
motor.
Remove obstruction
or if necessary, replace
blower motor.
Do resistance measurements
between windings and
chassis agree with values on
motor windings resistance
table (below)?
Is the blower motor
spinning freely?
NO
Fault Code Troubleshooting
YES
1. Locate the QC-11
Connector (6-pin
connector located on the
top-right side of the
oven, see page 49 for
schematic).
2. Disconnect the QC-11
Connector.
3. Ground pin 5 of the QC-
11 connector to the
chassis. Observe status
indicator on the display.
Does the “A” backlight
disappear when pin 5 is
grounded?
NO
NO
Is Status Indicator “A”
backlit in Test Mode?
(page 25)
YES
Check the wire harness
and if necessary, replace
the control board.
1. Test pin 1 of QC-11 connector for
control voltage.
2. Ground one lead and insert other into
pin 1 of the QC-11.
Is 0-10 VDC present throughout all speed
settings in Test Mode?
Check the wire harness and
if necessary, replace BMSC.
NO
YES
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