ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM

 

POSSIBLE CAUSES

 

 

 

Heating mode selector switch, adjustment

1.

Display/Keypad/CPU board malfunction. Verify keypad is

knob or keypad button(s) inoperative

 

functioning properly. See “DIAGNOSTIC TEST MODE -

(manual control).

 

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

1.

Low or no voltage on battery backup to maintain the oven

temperature display. (Programable control

 

control’s setup and program information in the event of a

only)

 

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.

 

 

 

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Vulcan-Hart VCE6H 126177, VCE20H 126172, VCE10H 126178, VCE20F 126173, VCE10F 126179 service manual Symptom Possible Causes

VCE10F 126179, VCE20F 126173, VCE6H 126177, VCE10H 126178, VCE20H 126172 specifications

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