Viking VUAR140 Troubleshooting Guide download pdf (Page 48)

TESTING PROCEDURES --VEDO273 Ele. OVEN

Service Information

The ERC operates in conjunction with a

transformer/ relay board 1, relay board 2, and

oven temperature sensor(s) to control all bake,

broil, convection and self clean functions.

The ERC is connected to a mylar control to

control minute timer, clock, stop time, oven

light, cancel, bake, bake time, broil, and clean.

Slew pads are used to set times and temperatures.

The mylar control panel provides input to the

ERC to control all functions.

The ERC display consists of two digital

readouts which displays all timing functions, and

all temperature functions.

The transformer/relay board for upper oven

consists of convection fan, oven light,

convection element, bake, broil, door lock, and

double line break relays controlled by the ERC,

and a step down transformer with two secondary

windings which convert 120 VAC input to

filament voltage to power the ERC display.

The relay board for lower oven consists of bake,

broil, door lock, and double line break relays

controlled by the ERC.

Oven temperature sensor 1 is mounted in the

upper oven cavity and connected to the J4

connector on the rear of the ERC. Oven

temperature sensor 2 is mounted in the lower

oven cavity and connected to the J6 connector on

the rear of the ERC. As the oven temperature

increases

the sensor resistance also increases. The ERC

converts this resistance to a corresponding

temperature readout and cycles the relay(s) to

maintain the desired temperature setting.

The ERC is also capable of sensing certain

failure conditions which can occur in the oven

temperature sensor(s), the self clean latch

switch(s) the adaptor board or the ERC itself. If

the ERC senses a failure, power will be removed

from the relays, an alarm will sound and a failure

code will be displayed.

Each major component of the Electronic Range

Control is serviced as a separate part. However,

each component and related wire harness must

be tested prior to replacing an individual

component.

Quick Test Procedure

“Quick Test” Mode for Electronic Range

Control

Follow procedure below to use the quick test

mode. Entries must be made within 32 seconds

of each other or the control will exit the quick

test mode. The quick test mode cannot be

reactivated until power is disconnected from

oven, and must be accessed within 5 minutes of

powering up.

NOTE:

To enter Quick Test Mode, this must be

the

first key pad entered after power is

applied.

Apply power to oven press and hold

BAKETIME

(Upper Oven) pad for 5 seconds.

2. Display will read the following:

Pad Response

CLEAN Double Line Break (DLB) on

BAKE DLB and Bake on

CONV. BAKE DLB, Bake and Conv Fan on

CONVECTIONDLB

Conv, Element and Fan

BROIL DLB and Broil on

CONV. BROIL DLB

Broil and Conv. Fan

STOP TIME Beeper on

BAKE TIME Displays manufacturer code

and sensor readings “000"=open sensor

TIMER Displays dashes

CLOCK

All display segments illuminated

OVEN LIGHT Oven light on

CANCEL Exit Quick Test

SLEW

Sequences through display segments

ERC Warning and Failure Codes

The Electronic Range Control is capable of

detecting certain failures within the ERC, along

with oven temperature sensor and self clean door

latch switch. The warnings and failure codes

which may appear on the display:

If “d o o r” flashes in display, switch positions

can only be displayed in Quick Test mode be

touching clean pad, as shown below:

1. Unlock switch closed

2. Lock switch closed

Digit Failure Display

F1 Control malfunction - Replace ERC

Oven over temperature - Check sensor wiring,

sensor, and temperature limiter.

Open sensor or sensor circuit - Check sensor

resistance and wiring.

F4 Shorted sensor or sensor circuit - Check

sensor resistance and wiring.

F7 Shorted input key - Verify control panel to

P.C. board connection, test control panel

continuity - Replace Control Panel.

F9 Failure of door lock switch sensing with

door locked- Check latch switch, door

motor, check plunger switch, and wiring.

FF Failure of door lock switch sensing with

door unlocked - Check latch switch, door

motor, check plunger switch, and wiring.

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Viking VUAR140 Troubleshooting Guide Page 48

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