Model # 450 FX-R NAT Official Williams wall furnace

Here are the diagrams and repair parts for Official Williams 450-FX-R-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 86 parts |

#47

All parts diagram

Thermocouple

Part #P042100

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

#8A

All parts diagram

Limit switch

Part #P200300

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

#48D

All parts diagram

Furnace pilot burner

Part #P179900

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

All parts diagram

Switch box

Part #11B05

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

#54B

All parts diagram

Wire

Part #P321524

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

All parts diagram

Top front panel

Part #7B126

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

#27B

All parts diagram

Furnace blower fan motor

Part #P321601

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

#15

All parts diagram

Vent cover

Part #7B12

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

#49

All parts diagram

Burn spacer

Part #P018100

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

#9C

All parts diagram

Select switch

Part #P296201

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

Symptoms for top-mount refrigerators

Why is there water in the bottom of the fridge under vegetable drawers?

Main causes: frozen or clogged defrost drain tube, cracked water system tubing…

How to replace a refrigerator water valve

Replace the water valve that feeds water to the ice maker and water dispenser if it no longer controls the flow of water…

Repair difficulty

Time required

15 minutes or less

How to replace the evaporator fan motor in a top-freezer refrigerator

The evaporator fan motor blows air across the evaporator coils and through the refrigerator cabinet for cooling. Replace…

Repair difficulty

Time required

15 minutes or less

How to replace the compressor start relay in a top-freezer refrigerator

The compressor start relay starts the compressor and shuts it off if the motor overheats. Replace the start relay if it'…

Repair difficulty

Time required

15 minutes or less

Articles and videos for top-mount refrigerators

How to Replace the Water Filter in a GE Refrigerator

Model # 450 FX-R NAT Official Williams wall furnace

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for top-mount refrigerators

Why is there water in the bottom of the fridge under vegetable drawers?

Repair guides for top-mount refrigerators

How to replace a refrigerator water valve

How to replace the evaporator fan motor in a top-freezer refrigerator

How to replace the compressor start relay in a top-freezer refrigerator

Articles and videos for top-mount refrigerators

How to Replace the Water Filter in a GE Refrigerator

How to Replace the Water Filter in a Maytag Refrigerator

How to Replace the Water Filter in a Frigidaire Refrigerator

Parts & More

Stay Connected

Quick links

Let us help you

More resources