Thermal Zone
Air Handler

Model #AH18A-1 Official Thermal Zone air handler

Here are the diagrams and repair parts for Thermal Zone AH18A-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:

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

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

    Showing 10 of 15 parts

    Capacitor#8

    Air handlers Diagram

    Capacitor

    Part #621435

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

    Motor#9

    Air handlers Diagram

    Motor

    Part #913357

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

    INDOOR COIL ASSEMBLY#13

    Air handlers Diagram

    Indoor coil assembly

    Part #914418

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

    Filter Cover#15

    Air handlers Diagram

    Filter cover

    Part #257961Z

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

    CAP, TOP WITH INSULATION#1

    Air handlers Diagram

    Cap, top with insulation

    Part #372105Z

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

    DRAIN PAN ONLY, SLAB COILS#14

    Air handlers Diagram

    Drain pan only, slab coils

    Part #668865

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

    Transformer#4

    Air handlers Diagram

    Transformer

    Part #620858

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

    UPPER DOOR WITH INSULATION#11

    Air handlers Diagram

    Upper door with insulation

    Part #372401Z

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

    COMPLETE BLOWER ASSEMBLY, 10 X 6, 1/4 HP#6

    Air handlers Diagram

    Complete blower assembly, 10 x 6, 1/4 hp

    Part #913875

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

    ELECTRICAL PANEL ASSEMBLY#2

    Air handlers Diagram

    Electrical panel assembly

    Part #470960

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

    Articles and videos common to all air handlers

    August 5, 2022

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

    By Lyle Weischwill

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