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Rheem
Furnace

Model # ONB Official Rheem counterflow oil furnace

Here are the diagrams and repair parts for Official Rheem ONB counterflow oil furnace, as well as links to manuals and error code tables, if available.

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

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Model diagram and schematic

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ALL PARTS
Showing 10 of 63 parts  |
Capacitor 43-20847-10

#NI

All parts diagram

Capacitor

Part #43-20847-10

Replaced by #12907

?
Manufacturer substitution
This part replaces 43-20847-10. Substitute parts can look different from the original.
This item is not returnable
$4.87 | 
17% OFF Phone Price : $5.87
In Stock
Weatherking Blow Cutoff AE-64401-18
#16C

Replacement parts diagram

Weatherking blow cutoff

Part #AE-64401-18

$23.58
In Stock
Blow Cutoff AE-64401-06
#16B

Replacement parts diagram

Blow cutoff

Part #AE-64401-06

$24.11
In Stock
Furnace Blower Fan Wheel 70-20602-01
#18B

Replacement parts diagram

Furnace blower fan wheel

Part #70-20602-01

$108.77 | 
10% OFF Phone Price : $120.77
In Stock
Blower Wheel 70-18631-01
#18

Replacement parts diagram

Blower wheel

Part #70-18631-01

$191.76
In Stock
Blower Wheel 70-18625-01
#18A

Replacement parts diagram

Blower wheel

Part #70-18625-01

$195.52
In Stock
Weatherking Rack AE-66681-01

#NI

All parts diagram

Weatherking rack

Part #AE-66681-01

$24.47
In Stock
Capacitor 43-20847-38

#NI

All parts diagram

Capacitor

Part #43-20847-38

Replaced by #43-25134-05

?
Manufacturer substitution
This part replaces 43-20847-38. Substitute parts can look different from the original.
$10.49
In Stock
Limit 47-17359-27

#NI

All parts diagram

Limit

Part #47-17359-27

Replaced by #47-21663-09

?
Manufacturer substitution
This part replaces 47-17359-27. Substitute parts can look different from the original.
$28.13
In Stock
Switch 47-20545-82
#8

Replacement parts diagram

Switch

Part #47-20545-82

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

Symptoms for gas ranges

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…

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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…

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Repair guides for gas ranges

How to replace oven door hinges on a gas range

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.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a range spark igniter switch

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…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a range spark igniter electrode

How to replace a range spark igniter electrode

Learn how to replace the spark igniter electrode for the surface burners on a gas range or dual-fuel range.…

Read more
Repair difficulty
Time required
 45 minutes or less

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How to get your furnace ready for winter

Get expert tips for preparing your furnace for winter. Follow maintenance tips to keep your furnace in top shape.…

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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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