Horizon
Treadmill

Model # DT850 Official Horizon treadmill

Here are the diagrams and repair parts for Official Horizon DT850 treadmill, 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 148 parts  |

Controller SZTM113MCB
#M03

Treadmill assy diagram

Controller

Part #SZTM113MCB

Replaced by #032669-IF

?
Manufacturer substitution
This part replaces SZTM113MCB. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$227.44
$10.00 OFF Phone Price : $237.44
In Stock
Socket MC0703023
#P11

Treadmill assy diagram

Socket

Part #MC0703023

Replaced by #019749-A

?
Manufacturer substitution
This part replaces MC0703023. Substitute parts can look different from the original.
This item is not returnable
$9.62
9% OFF Phone Price : $10.62
In Stock
Ac Cord MC0504054A
#P07

Treadmill assy diagram

Ac cord

Part #MC0504054A

Replaced by #002169-A

?
Manufacturer substitution
This part replaces MC0504054A. Substitute parts can look different from the original.
$46.34
10% OFF Was : $51.49
In Stock
Deck Bolt MZE0105005
#B36

Treadmill assy diagram

Deck bolt

Part #MZE0105005

Replaced by #004562-00

?
Manufacturer substitution
This part replaces MZE0105005. Substitute parts can look different from the original.
This item is not returnable
In Stock
Switch MC0701002
#P02

Treadmill assy diagram

Switch

Part #MC0701002

Replaced by #003326-00

?
Manufacturer substitution
This part replaces MC0701002. Substitute parts can look different from the original.
$27.79
15% OFF Phone Price : $32.79
In Stock
Wheel MB0103040CA
Wheel

Part #MB0103040CA

Replaced by #000037-CA

?
Manufacturer substitution
This part replaces MB0103040CA. Substitute parts can look different from the original.
This item is not returnable
In Stock
Control Board SJED01170AA
#N60

Treadmill assy diagram

Control board

Part #SJED01170AA

Replaced by #013626-BBX

?
Manufacturer substitution
This part replaces SJED01170AA. Substitute parts can look different from the original.
In Stock
Screw MZE0121004
#B39

Treadmill assy diagram

Screw

Part #MZE0121004

Replaced by #004865-00

?
Manufacturer substitution
This part replaces MZE0121004. Substitute parts can look different from the original.
This item is not returnable
In Stock
Nylon Nut ME0204025
Nylon nut

Part #ME0204025

Replaced by #004941-00

?
Manufacturer substitution
This part replaces ME0204025. Substitute parts can look different from the original.
This item is not returnable
In Stock
Cable MC0525034B
#P10

Treadmill assy diagram

Cable

Part #MC0525034B

Replaced by #002514-B

?
Manufacturer substitution
This part replaces MC0525034B. Substitute parts can look different from the original.
This item is not returnable
In Stock

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor co…

Main causes: rear roller out of alignment, damaged walking belt, bad roller…

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: 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: damaged walking belt, improper belt tension, bad roller bearing…

Repair guides for treadmills

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

How to replace a treadmill motor controller

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…

Repair difficulty
Time required
 15 minutes or less
How to replace a treadmill walking belt

How to replace a treadmill walking belt

A worn walking belt will begin to slow down during use. If your treadmill walking belt is worn out, replace it using the…

Repair difficulty
Time required
 45 minutes or less
How to replace a treadmill drive motor

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'…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your fitness & exercise

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

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…