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ELECTRIC COMBI OVENS - TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
Page 64 of 68
Convection heat error light and steam heat
error light on.
1. Cavity high temperature limit(s) open (manual reset).
2. Fuse F7 open.
3. Steam generator thermal fuse(s) open.
Cavity fan motor inoperative and cavity fan
error light on.
1. Cavity fan motor values in the oven control configuration
setup are incorrect. See “CONFIGURATION MODE -
PROGRAMABLE CONTROL” or “CONFIGURATION
MODE MANUAL CONTROLS” in “SERVICE
PROCEDURES”AND ADJUSTMENTS”.
2. Motor shaft is rubbing against the opening in the rear of
the cavity.
NOTE
: This may only occur when the cavity is at a high
temperature. If this is true, then remove the motor and
inspect the shaft for scratches.
3. Internal motor protector open.
4. Fuse F7 on relay board open.
5. Cavity high temperature limit(s) open (manual reset).
6. Steam generator thermal fuse(s) open.
7. Auxiliary contactor switch(s) on contactor KM1 or KM2
malfunction.
8. Cavity fan motor(s) malfunction.
9. Oven control malfunction.
Oven inoperative and displays are blank. 1. Incoming voltage to machine not present or incorrect.
2. Line fuses F8 and/or F9 open.
3. Voltage tap wire on power supply board not
connected or
connected to wrong voltage for the machine.
4. Fuse F1 and/or F2 on the power supply board open.
5. Ribbon cable connector to relay board and CPU board is
not inserted properly.
NOTE
: Connector should snap into
position.
6. Relay board connector (J6) and/or power supply board
connector is not inserted properly.
7. Battery backup voltage low or near zero.
8. Power supply board and transformer (1T) malfunction.
9. Oven control board inoperative.
One or more service error light(s) at bottom
of keypad come on.
1. Water supply not on or clogged.
2. Convection heat malfunction.
3. Steam generator heat malfunction.
4. Cavity fan malfunction.
Convection heaters inoperative. 1. No voltage to heating elements.
A. Cavity high temperature limit(s) open (manual reset).
B. Steam generator thermal fuse(s) open.
C. Contactor(s) malfunction. See “HEATING MODE
AND CAVITY FAN SPEEDS” under “ELECTRICAL
OPERATION”.
2. Convection heating element(s) malfunction.
3. Relay board malfunction (K6, K7 relay)
4. Oven control board malfunction.