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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 User Interface. Confirm connection between
the Display and User Interface.
3.
For single ovens: check the wiring from L1 to SMPS (CONN7‑2)
For double ovens: check the wiring from L1 to Upper Copernicus
Appliance Manager (J8‑1).
Single Oven
Speaker
N L1
HMI Left
J6
EOL
1
2
GN
GN
2
2
1
1
RD/WH
RD/WH
CONN 2
CONN 7
1
SMPS
2
14 VDC
15W
BK
WH
Failure/Error Display Codes
Copernicus Appliance Manager, User
Interface
BK
Control Panel Assembly
2
J8
1
RD
HMI-C
J4
J5
User Interface
J7
HMI Right
J15
1
2
3
4
J15 Wires Colors
2 - YL
BU
3 - OR
OR
1
YL
2
4 - BU
3
YL
4
BR
5
6
1
2
3
4
5
P1
Copernicus
Appliance
1
Manager
BK
2
J8
Double Oven
Speaker
J6
HMI Left
N L1
EOL
1
2
GN
2
1
RD/WH
WH
4.
Check connection from wiring harness to User Interface (J15).
5.
Check proper voltage input at J15‑2 (GND) to J15‑4 (14 VDC) on the User
Interface by completing the following steps:
6.
Connect voltage measurement equipment to J15‑2 and J15‑4 on User
Interface.
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. Go to Step 16.
9.
If voltage is not correct, go to Step 10.
10. Unplug oven or disconnect power.
For single ovens: replace the Switch Mode Power Supply (SMPS).
For double ovens: replace the Copernicus Appliance Manager.
11. Reassemble all parts and panels before operating.
12. Plug in oven or reconnect power.
13. Check for control board display. If still no display, unplug oven or
disconnect power.
14. Replace User Interface.
15. Plug in oven or reconnect power.
16. Reassemble all parts and panels before operating.
17. Plug in oven or reconnect power.
7
Control Panel Assembly
BK
J8
2
1
RD
HMI-C
J4
J5
J7
HMI Right
User Interface
J15
1
2
3
4
BK
YL
OR
GN
2
1
RD/WH
BU
YL
OR
BK
YL
OR
1
2
3
4
5
1
2
3
4
5
P1
P1
Upper Copernicus
BK
Lower Copernicus
1
Appliance
1
Appliance
2
2
WH
Manager
J8
Manager
J8
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