Thermal Zone
Air Handler

Model # AV18B-1 Official Thermal Zone air handler

Here are the diagrams and repair parts for Official Thermal Zone AV18B-1 air handler, 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

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 17 parts  |

Blower Wheel 667037
#7

Air handlers diagram

Blower wheel

Part #667037

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

Motor Cable, 2-wire (not Shown) 257400
#18

Air handlers diagram

Motor cable, 2-wire (not shown)

Part #257400

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

Complete Blower Assembly, 10 X 8, 1/2 Hp 913879
#6

Air handlers diagram

Complete blower assembly, 10 x 8, 1/2 hp

Part #913879

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

Horizontal Drain Pan Assembly (not Shown) 914729
#16

Air handlers diagram

Horizontal drain pan assembly (not shown)

Part #914729

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

Lower Door With Insulation 499871Z
#12

Air handlers diagram

Lower door with insulation

Part #499871Z

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

Upper Door, With Insulation 372021Z
#11

Air handlers diagram

Upper door, with insulation

Part #372021Z

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

Indoor Coil Assembly 914400
#13

Air handlers diagram

Indoor coil assembly

Part #914400

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

Circuit Board Only 624552
#2A

Air handlers diagram

Circuit board only

Part #624552

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

Transformer 620858
#4

Air handlers diagram

Transformer

Part #620858

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

Electrical Panel Assembly 371840
#2

Air handlers diagram

Electrical panel assembly

Part #371840

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

Symptoms for top-mount refrigerators

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

Repair guides for top-mount refrigerators

How to replace a refrigerator water valve

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 compressor run capacitor in a top-freezer refrigerator

How to replace the compressor run capacitor in a top-freezer refrigerator

The run capacitor sends electric current to the compressor motor to help the motor run efficiently. Replace the run capa…

Repair difficulty
Time required
 15 minutes or less
How to replace the defrost thermistor in a top-freezer refrigerator

How to replace the defrost thermistor in a top-freezer refrigerator

The defrost thermistor attaches to the evaporator coil and measures the evaporator coil temperature during defrost.…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your air handlers

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

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.…