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No Display - control is blank
SUGGESTED CORRECTIVE ACTION PROCEDURE
NOTE: Before starting any test, cycle power to the oven (power off, wait 10
seconds, and power on).
1.
Unplug oven or disconnect power.
2.
Remove plastic cover from UI. Check connection from display to UI.
3.
Check wiring from main line to SMPS (CONN 7).
HMI Left
J6
N L2 L1
CONN7
WH
SMPS
2
14 V DC
1
BK
15W
Line
20A Fuse
BK
P32
P33
BR
Line
L1
Filter
WH
41 WH
42 WH
P31
P34
Thermostat
4.
Check connection from wiring harness to UI (J15).
5.
Check proper voltage input at J15-2 (GND) to J15-4 (14 VDC) on the UI
by completing the following steps.
6.
Connect voltage measurement equipment to J15-2 and J15-4 on UI.
7.
Plug in oven or reconnect power.
8.
Measure voltage and confirm voltage reading is 14 VDC. If voltage is
correct, unplug oven or disconnect power and go to Step 13. If voltage
is not correct, go to Step 9.
9.
Unplug oven or disconnect power. Replace the SMPS.
10. Reassemble all parts and panels before operating.
11. Plug in oven or reconnect power.
Failure/Error Display Codes
Switch Mode Power Supply (SMPS), User
Interface (UI)
User Interface
J4
J5
J7 HMI Right
J15
Control Panel Assembly
1 2 3 4
OR
YL
OR
BR OR
6
YL
OR
YL
5
4
3
1 2 3 4 5
BU
2
1
CONN2
Appliance
BK
1
2
J8
WH
P26
1 2 3 4 5
P1
4
Microwave
3
2
Appliance
1
52 BU
Manager
Cavity
12. Check for control board display. If still no display, unplug oven or
disconnect power.
13. Replace HMI-Central/UI board.
14. Reassemble all parts and panels before operating.
15. Plug in oven or reconnect power. If the UI was replaced, follow the on-
screen prompts to select the model number.
16. Verify operation is normal. If problem persists, replace the Control Panel
Assembly and repeat steps 14 through 16.
P1
Oven
Manager
7
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