6-1

DIAGNOSIS & TROUBLESHOOTING

DIAGNOSIS

• All units that have failed during the first few
days of use should be checked for loose
connections, or miswiring.
• All checks should be made with a meter
having a sensitivity of 20,000 ohms-per-volt,
or greater.

FAILURE/ERROR DISPLAY CODES

TECH SHEET #9753028, REV. B

• All diagnoses of this range must begin with a
normal check of the line voltage, blown fuses,
and failed components.
FAULT
PRIORITY
FAULT ERROR FAULT CONSTANT
NAME IN SOFTWARE FAULT DESCRIPTION FIELD SERVICE ACTION
Fault EEPROM
EEPROM checksum error
Config jumpers no match
Q8 shorted
Stack overflow
Keypad switch assy
misconnected
Cancel key channel
Key down too long
Keys unsettled
Cancel key failed
Open oven sensor
Shorted oven sensor
Oven temp too high
Shorted meat probe
Door open and locked
Self clean latch won’t
make
Loss of GND, L1 N
reverse
Self clean temp not
satisfied
Door open and locked
Door will not unlatch
Ambient over temp
Input switch error
EEPROM read fault (silent fault, not displayed)
EEPROM checksum does not match at start
key (silent fault, not displayed)
Configuration jumper change, ranges with front
control and fluorescent light:electric switches
or P9 pins 6 and/or 7 changed since power up
Q8 shorted
Stack overflow, highest priority
Keypad switch assy misconnected to control
Cancel key loop test failed
Key held down too long or keyboard short
Keys unsettled probably due to noise
Cancel key failed
Oven sensor open
Shorted oven sensor
Oven temp too high (runaway)
Meat probe shorted (less than 1500 ohms)
Door locked somehow with door open
Self clean latch lock make after 30 seconds
Loss of 120 VAC across L1 to ground or Q19
circuit error
Self clean temperature not satisfied after 30
minutes
Door locked somehow with door open
Door unlocked somehow and will not unlatch
Ambient (console bi-metal) sensor opened
(too hot)
Input switches won’t follow their strobe level
(shorted to ground)
Power Failure (Not a Failure Mode)
Replace control
Replace control
See below left
Replace control
Replace control
Verify insertion of ribbon into timer
connector.Replace keypad sw assy
Replace keypad sw.assy
Press Cancel.Wait 2 sec. between
each key entry.If reappears replace
keypad switch assy
Press Cancel.Remove electrical
noise source.If reappears replace
keypad switch assy
Replace keypad switch assy
Replace oven sensor
Replace oven sensor
Replace oven sensor, or control
Replace meat probe
Check door switch, latch switch
Check latch system
Check ground continuity on all
ground harnesses.Replace control
Check insertion of hinges in
receivers.Check operation of
elements.
Check door switch, latch switch
Check door switch, latch switch
Check control bi-metal
Check door switch, latch switch,
etc.
Do not replace control
E0
E1
E3
E4
E9
E0
E2
E3
E4
E5
E0
E1
E2
E1
E0
E1
E3
E5
E6
E7
E0
E0
N/A
N/A
7
2
0
4
3
5
6
N/A
9
8
10
15
N/A
13
1
14
16
17
12
11