Janitrol
Furnace

Model #GUN100-4B Janitrol gas furnace

Here are the repair parts and diagrams for your Janitrol GUN100-4B gas furnace. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

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Showing 10 of 115 parts

Furnace Burner Roll-Out Limit Switch

#1

Heat exchanger assembly Diagram

$7.82

In Stock

Secondary Ai

#5A

Heat exchanger assembly Diagram

Secondary ai

Part #18224-09
This item is not returnable
$2.49

In Stock

Furnace Burner Flame Sensor

#7

Gas train Diagram

$11.12

In Stock

Manifold, 2

#6

Gas train Diagram

Manifold, 2

Part #B18264-16
$10.42

In Stock

Comb Box Frt

#15

Heat exchanger assembly Diagram

Comb box frt

Part #18820-14
This item is not returnable
$6.99

In Stock

Cover, Cumbu

#15B

Heat exchanger assembly Diagram

Cover, cumbu

Part #18820-16
$8.49

In Stock

Burner Box T

#14

Heat exchanger assembly Diagram

Burner box t

Part #18823-00
$19.49

In Stock

Air Pressure

#4B

Misc. electrical/hardware Diagram

Air pressure

Part #B13701-31
$43.99

In Stock

Motor Mounting Bracket

#6

Blower assembly Diagram

Motor mounting bracket

Part #B13768-59
This item is not returnable
$3.99

In Stock

Manifold, 3

#6E

Gas train Diagram

Manifold, 3

Part #B18264-13
$8.08

In Stock