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Horizon incline motor does not stop

by Mike

Hi Greg,

I bought a used Horizon CT7.1 (about 4 years old) turned it on and it was working for about 3 minutes.

Then I changes some settings (speed , incline) and the running belt stopped and the incline moved to the highest level.

It seems that the incline motor doesn't even stop (and tries to incline even more) as the incline motor gets hot.

Even when I unplug/turn off the treadmill and then turn it on again, the incline motor immediately tries to incline even more (but its already at the maximum).

The display still indicates speed and incline level according to my button settings - but as already mentioned, the belt is not moving and incline is on max.

I contacted already Horizon and they say that most likely the upper control board is broken.
(but a new upper control board would cost even more than I paid for the treadmill)

As I have an electronics engineering education I would be able to check, repair something on the board.

Do you have a hint for me, what could be broken or what I could check/replace or a circuit plan?

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Feb 27, 2017
Mikes's problem-replicated
by: Bob

It seems that the solution to this E-1 STALL electronics diagnosis was replacement of something called a CI. What is it and how can I accomplish the fix? Thanks, Long time user of my TRUE 500.

Jan 24, 2017
by: Mike

Hi there,

thank you very much for the great hint!!!
I replaced the IC (cost: ~50 cents) and the treadmill works again!
Thank you so much!


Dec 27, 2016
Seen this before....
by: jatinah electronics

Hi There,

Due to your experience in electronics I can feel fairly comfy letting you know what needs to be done, very gently.

The only time I have heard of whacky lift functions when console overlays or buttons are in good shape, leads to a 74hct02 or 74hc02 chip that acts as a buffer from the console CPU to the lower control board, and can be found near the console connector location of that upper board.

If this IC fails it causes troubles, and is a tender job to replace the surface mount part.

If you need further help you can reach me

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