Troubleshooting
M Series Wall Oven
M Series Wall Oven
4-13
#824974 - Revision C - November, 2016
2820
2930
2A30
2B30
2C20
2D30
2E30
2
3
3
3
2
3
3
Relay board MDL relay circuit fault
Relay board conversion circuit fault
Microprocessor comm fault
Microprocessor monitor circuit fault
Relay board network fault
Relay board 13.5 VDC fault
Relay board 12 VDC fault
Relay board internal MDL
relay circuit fault. Not able to
test.
Relay board internal conver-
sion circuit fault. Not able to
test.
Not able to test.
Not able to test.
Try removing any external
RS485 connections.
Reseat RS485 comm cable
Relay board 13.5 VDC fault.
Not able to test.
12 VDC for external RS485
connection.
See Procedure A.
See Procedure A.
See Procedure A.
See Procedure A.
Replace UIP.
See Procedure A.
Clear fault unless Smart Grid
system is being used. If
Smart Grid being used -
replace relay board.
Fault
Priority
Fault Message Test
Action
3031
3032
3121
3122
3221
3222
3
3
2
2
2
2
Upper temperature probe shorted
Lower temperature Probe shorted
Upper RTD shorted
Lower RTD shorted
Upper RTD open
Lower RTD open
See Procedure B.
See Procedure B.
See Procedure C.
See Procedure C.
See Procedure C.
See Procedure C.
1. Try to clear fault.
2. If no short found replace
relay board.
1. Try to clear fault.
2. If no short found replace
relay board.
1. Try to clear fault.
2. If no short found replace
relay board.
1. Try to clear fault.
2. If no short found replace
relay board.
1. Try to clear fault.
2. If no open found replace
relay board.
1. Try to clear fault.
2. If no open found replace
relay board.
Fault
Priority
Fault Message Test
Action
External Component Or Wiring Faults
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