Troubleshooting
M Series Wall Oven
M Series Wall Oven
4-15
#824974 - Revision C - November, 2016
3721
3722
3821
3822
3921
3922
3A20
3B20
3C20
3D20
4031
4032
4131
2
2
2
2
2
2
2
2
2
2
3
3
3
Upper MDL invalid switch position
Lower MDL invalid switch position
Upper bake bank wiring fault
Lower bake bank wiring fault
Upper broil bank wiring fault
Lower broil bank wiring fault
Auxiliary bank wiring fault
Low input voltage
High input voltage
Input voltage frequency fault
Upper bake element not detected
Lower bake element not detected
Upper right convection element not
detected
See Procedure F.
See Procedure F.
Bake element not energized.
1. Measure voltage from P1-4
to ground.
2. Measure voltage from P2-4
to ground.
Bake element not energized.
1. Measure voltage from P1-4
to ground.
2. Measure voltage from P2-4
to ground.
Broil element not energized.
1. Measure voltage from P3-4
to ground.
2. Measure voltage from P4-4
to ground.
Broil element not energized.
1. Measure voltage from P7-4
to ground.
2. Measure voltage from P8-4
to ground.
Lights, MDL, convection fans,
and cooling fan not energized.
1. Measure voltage from P5-1
to ground.
2. Measure voltage from P5-9
to ground.
3. On double ovens measure
voltage J6-1 to ground.
J7-1 to J7-5 (L1 to L2) voltage
below 177 VAC.
J7-1 to J7-5 (L1 to L2) voltage
above 265 VAC.
Input voltage frequency not
between 47 Hz and 63 Hz.
Not able to test.
Ohm wire from P1-1 to wire
from P2-6.
Ohm wire from P5-1 to wire
from P6-6.
Ohm wire from P1-6 to wire
from P2-6.
Repair/replace wiring or
replace MDL.
Repair/replace wiring or
replace MDL.
No 120 volts from either test:
1. Verify L1 and L2 supply
are good.
2. Repair wiring.
3. Replace relay board.
No 120 volts from either test:
1. Verify L1 and L2 supply
are good.
2. Repair wiring.
3. Replace relay board.
No 120 volts from either test:
1. Verify L1 and L2 supply
are good.
2. Repair wiring.
3. Replace relay board.
No 120 volts from either test:
1. Verify L1 and L2 supply
are good.
2. Repair wiring.
3. Replace relay board.
No 120 volts from any test:
1. Verify L1 and L2 supply
are good.
2. Repair wiring.
3. Replace relay board.
Check supply voltage, termi-
nal block and wiring.
Check supply voltage, termi-
nal block or wiring issue.
Supply voltage issue.
If not 15.4 to 17 ohms
replace bake element.
If not 15.4 to 17 ohms
replace bake element.
If not 22 to 25.6 ohms
replace convection element.
Fault
Priority
Fault Message Test
Action
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