Model # 400DVI NAT Official Williams wall furnace

Here are the diagrams and repair parts for Official Williams 400DVI-NAT wall furnace, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 66 parts |

#43A

All parts diagram

Thermocouple

Part #P254000

The manufacturer no longer makes this part, and there's no substitute part

#12

All parts diagram

Limit switch

Part #P200300

The manufacturer no longer makes this part, and there's no substitute part

#45

All parts diagram

Tube seal

Part #11A41

The manufacturer no longer makes this part, and there's no substitute part

#16

All parts diagram

Furnace transformer

Part #P024200

The manufacturer no longer makes this part, and there's no substitute part

#43

All parts diagram

Furnace burner flame sensor

Part #P271100

The manufacturer no longer makes this part, and there's no substitute part

All parts diagram

Liner assembly

Part #11B46

The manufacturer no longer makes this part, and there's no substitute part

#NI

All parts diagram

Wire bridle

Part #31B036

The manufacturer no longer makes this part, and there's no substitute part

#47

All parts diagram

Burn spacer

Part #P018100

The manufacturer no longer makes this part, and there's no substitute part

All parts diagram

Casing assembly

Part #11C42-2

The manufacturer no longer makes this part, and there's no substitute part

Furnace Burner Pan Gasket, 44-in P101600

#46

All parts diagram

Furnace burner pan gasket, 44-in

Part #P101600

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas ranges

Why isn't my range's gas burner heating properly?

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t…

Why won't my range's gas burner spark or ignite?

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure…

How to replace oven door hinges on a gas range

See how to replace the oven door hinges on a gas range yourself, in just 30 minutes.…

Repair difficulty

Time required

15 minutes or less

How to replace a range spark igniter switch

Follow these steps to replace the spark igniter switch—sometimes called a burner switch or spark switch—on a gas or dual…

Repair difficulty

Time required

60 minutes or less

How to replace a gas range oven control board

These step-by-step instructions explain how to replace an oven control board on a gas range…

Repair difficulty

Time required

15 minutes or less

Articles and videos for gas ranges

Model # 400DVI NAT Official Williams wall furnace

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for gas ranges

Why isn't my range's gas burner heating properly?

Why won't my range's gas burner spark or ignite?

Repair guides for gas ranges

How to replace oven door hinges on a gas range

How to replace a range spark igniter switch

How to replace a gas range oven control board

Articles and videos for gas ranges

How to clean and maintain your stove

Oven won't heat: troubleshooting gas range problems video

How to clean grates and burners on a gas cooktop video

Parts & More

Stay Connected

Quick links

Let us help you

More resources