Trouble-Shooting Guide; Oven - Nu-Vu SUB-123 Owner's Manual

Oven / proofer

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Table Of Contents

Table of Contents

SUB–123 OWNER'S MANUAL

OVEN:

The Oven Power Switch is in the ON position and there are no lights, heat, humidity

or motor rotation:

A. Check the control fuses on the back panel at the top of the unit.

Check the main wall breaker or fuse box for a tripped power breaker or blown fuse.

Check the electrical connections to the Oven Power Switch. All connections must be clean and

tight.

D. Check the connections from the main breaker or fuse box to the Power Terminal Block (refer to

Fig. #2 on page 5). All connections must be clean and tight.

Check the voltage from the main breaker or fuse box to the Power Terminal Block and compare

it to the requirements listed on the equipment label.

If all electrical connections and readings are correct as to voltage and phase, the Oven Power

Switch probably needs to be replaced (refer to POWER SWITCH, How To Replace in the

SERVICE AND REPLACEMENT GUIDE).

II.

The Oven operates but you have slow warm-up and recovery times:

A. Check for proper voltage, phase and amperage against the requirements listed on the equipment

label. Use a volt/amp meter on the wires to the Power Terminal Block [1] (refer to Fig. #2 on

page 5).

Check the Oven Heating Elements [6] on the ceiling of the Oven by removing the Oven Element

Cover [52]. Turn the Oven ON and set the Temperature Control [22] to 250 ° to see if the

Heating Elements become "red-hot". Replace any Heating Elements that fail to become "red-hot"

(refer to OVEN HEATING ELEMENT, How To Replace in the SERVICE AND REPLACEMENT

GUIDE).

NOTE: The Heating Elements will not function until the Oven Door is closed or the Door Micro

Switch [15] in the jamb below the Door Hinge is depressed by hand.

Check the Temperature Control [22] against a reliable oven thermometer. Place the thermometer

on a pan in the center of the Oven and set the Temperature Control to 350 ° . Compare the

thermometer reading against the Temperature Control setting when the Temperature Control

Indicator Light [23] goes out. If there is more than 5 ° difference the Temperature Control may

need a simple adjustment (refer to TEMPERATURE CONTROL, How to Adjust in the SERVICE

AND REPLACEMENT GUIDE).

III.

The Oven Motor cuts out or will not start when the Oven Door is closed:

A. Open the Oven Door and depress the Micro Switch [15] by hand. If the Oven Motor [7] starts,

the Micro Switch may only need adjustment (refer to MICRO SWITCH, How To Replace in the

SERVICE AND REPLACEMENT GUIDE).

If depressing the Micro Switch by hand fails to start the Oven Motor, check the wiring

connections between the Power Switch [21], the Micro Switch and the Oven Motor.

If both the Oven Motor and the Temperature Control do not function when the Micro Switch is

depressed, the Micro Switch itself is bad and must be replaced (refer to MICRO SWITCH, How

to Replace in the SERVICE AND REPLACEMENT GUIDE).

D. If the Temperature Control functions properly but the Oven Motor still does not run, the Oven

Motor is probably bad and should be replaced (refer to OVEN MOTOR, How to Replace in the

SERVICE AND REPLACEMENT GUIDE).

NU-VU

FOOD SERVICE SYSTEMS

(800) 338-9886

TROUBLE–SHOOTING GUIDE

Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322