Horizon
Treadmill

Model #CST5 Horizon treadmill

Here are the diagrams and repair parts for Horizon CST5 treadmill, 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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For DIY troubleshooting advice and repair guides, visit our repair help section.

    Showing 10 of 137 parts

    Membr Key

    #N06

    Treadmill Diagram

    Membr key

    Part #MC0602195A
    $16.98

    In Stock

    Spring Washer

    #H23

    Treadmill Diagram

    Spring washer

    Part #005009-AB
    ?
    Manufacturer substitution
    This part replaces MZE0501016AB. Substitute parts can look different from the original.
    This part replaces MZE0501016AB
    This item is not returnable
    $2.16

    In Stock

    Treadmill Motor Control Board

    #M03

    Treadmill Diagram

    Treadmill motor control board

    Part #032669-IF
    ?
    Manufacturer substitution
    This part replaces SZTM115MCB. Substitute parts can look different from the original.
    This part replaces SZTM115MCB
    $279.99

    In Stock

    Rubber Pad

    #M07

    Treadmill Diagram

    Rubber pad

    Part #056374-AA
    ?
    Manufacturer substitution
    This part replaces MB0607001B. Substitute parts can look different from the original.
    This part replaces MB0607001B
    This item is not returnable
    $5.66

    In Stock

    Treadmill Reed Switch

    #N13

    Treadmill Diagram

    Treadmill reed switch

    Part #001963-A
    ?
    Manufacturer substitution
    This part replaces MC0403014A. Substitute parts can look different from the original.
    This part replaces MC0403014A
    This item is not returnable
    $3.02

    In Stock

    Exercise Equipment Nut

    #H10

    Treadmill Diagram

    Exercise equipment nut

    Part #004941-00
    ?
    Manufacturer substitution
    This part replaces ME0204025. Substitute parts can look different from the original.
    This part replaces ME0204025
    This item is not returnable
    $2.16

    In Stock

    Exercise Equipment Washer

    #H20

    Treadmill Diagram

    Exercise equipment washer

    Part #005035-00
    ?
    Manufacturer substitution
    This part replaces MZE0502014. Substitute parts can look different from the original.
    This part replaces MZE0502014
    This item is not returnable
    $2.47

    In Stock

    WASHER

    #Z08

    Treadmill Diagram

    Washer

    Part #005211-A
    ?
    Manufacturer substitution
    This part replaces MZE0505063A. Substitute parts can look different from the original.
    This part replaces MZE0505063A
    This item is not returnable
    $2.16

    In Stock

    Treadmill Nut

    #R10

    Treadmill Diagram

    Treadmill nut

    Part #004903-Z
    ?
    Manufacturer substitution
    This part replaces MZE0201038. Substitute parts can look different from the original.
    This part replaces MZE0201038
    This item is not returnable
    $2.16

    In Stock

    Treadmill Reed Switch

    #NI01

    All parts Diagram

    Treadmill reed switch

    Part #002248-D
    ?
    Manufacturer substitution
    This part replaces MC0510093B. Substitute parts can look different from the original.
    This part replaces MC0510093B
    $8.16

    In Stock

    Symptoms for treadmills

    Choose a symptom to see related treadmill repairs.

    Main causes: bad control console, wiring failure, bad motor control board
    Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor
    Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor control board
    Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor
    Main causes: faulty sensors, wiring failure, bad control console
    Main causes: damaged walking belt, improper belt tension, bad roller bearing
    Main causes: rear roller out of alignment, damaged walking belt, bad roller

    Repair guides for treadmills

    These step-by-step repair guides will help you safely fix what’s broken on your treadmill.

    June 1, 2015
    By Lyle Weischwill
    How to replace a treadmill motor controller

    Your treadmill motor won't run with a defective motor controller. Replace the motor controller if it doesn't operate the motor correctly.

    Repair difficulty
    Time required
     15 minutes or less
    June 1, 2015
    By Lyle Weischwill
    How to replace a treadmill drive motor

    A defective drive motor won't run when activated by the motor controller. Replace the treadmill drive motor if it doesn't run.

    Repair difficulty
    Time required
     15 minutes or less
    June 1, 2015
    By Lyle Weischwill
    How to replace a treadmill walking board

    A worn-out walking board creates friction with the walking belt and causes the belt to slow down during use. Replace the walking board if it's worn or damaged.

    Repair difficulty
    Time required
     30 minutes or less

    Articles and videos for treadmills

    Use the advice and tips in these articles and videos to get the most out of your treadmill.

    December 21, 2016

    How to troubleshoot treadmill problems

    By Sears PartsDirect staff

    See what to check if you're having a problem with your treadmill, and what you can do to fix it.

    June 1, 2015

    Treadmill common questions

    By Sears PartsDirect staff

    These answers to common questions can help you make the most of your treadmill.

    May 10, 2015

    How to maintain a treadmill

    By Sears PartsDirect staff

    Keep your treadmill in shape by following these tips.