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ELECTRIC COMBI OVENS - TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
Page 67 of 68
Heating mode selector switch, adjustment
knob or keypad button(s) inoperative
(manual control).
1. Display/Keypad/CPU board malfunction. Verify keypad is
functioning properly. See “DIAGNOSTIC TEST MODE -
MANUAL CONTROLS” under “SERVICE PROCEDURES
AND ADJUSTMENTS”.
2. If keypad test is inaccessible, the oven control board may
not be properly mounted to the front panel. If the
mounting washers are stacked too high or the weld studs
have excessive flash, the oven control board will be
positioned to far from the keypad to actuate the buttons
when pressed.
Door will not lock. 1. Door handle magnet not positioned over door reed switch.
2. Door reed switch open. (Check switch operation with an
alternate magnet)
3. Fuse F3 open.
4. Relay board malfunction (K1 relay).
5. Door motor & switch mechanism inoperative.
6. Motor stop mechanism remains in the open position.
“HHH” in the time display and “025” in the
temperature display. (Programable control
only)
1. Low or no voltage on battery backup to maintain the oven
control’s setup and program information in the event of a
power loss. See “BATTERY BACKUP - PROGRAMABLE
CONTROL” under “SERVICE PROCEDURES AND
ADJUSTMENTS”.
Water in component area. 1. Cavity drain “gasket” not sealing properly.
2. Heating element(s) “o-ring” not sealing properly.
Water in bottom of cavity. 1. Water too soft for water level sensors to conduct
electricity.
2. Water level sensor leads loose or disconnected.
3. Lime scale build up on water level sensors giving false
reading. See note at the beginning of troubleshooting
section.
4. Excessive lime descale solution added to steam
generator for clean cycle deliming. The increased
concentration interferes with water level sensing and
causes the steam generator to overfill.
5. Drain line clogged causing backup.
6. Water solenoid valve remains open.
7. Relay board malfunction (K3, K5 relay).
8. Water level sensor(s) malfunction.
9. Oven control board malfunction.
Cavity vent not operating. 1. Vent motor not receiving voltage.
A. Motor leads loose or disconnected.
B. Relay board malfunction (K2 relay).
2. Vent motor/micro switch assembly (4SW) malfunction.
3. Mechanical binds on shaft extension rod or obstructions in
vent housing.
4. Shaft extension rod not turning with motor. Mounting
screw missing in rod.
5. Oven control board malfunction.