Merit 725 T plus reading E1

Check here for guidance on how replace or repair your safety key:
http://www.partsfortreadmill.com/parts-for-treadmill/treadmill-safety-key/
http://www.treadmillsrepair.co.uk/2014/08/treadmill-safety-key.html

Had the same issue, bought some cheap inks off the internet and the printer wouldn't accept them, bought the proper dell cartridge did a head clean and it worked ok.

I just found out I had lost my key too. I have a Merit 710T. I called the company and they directed me to their website.

http://store.horizonfitness.com/c-33-safety-keys.aspx

On the page there is a link to a chart which will tell you what key is right for your model. They are cheap, only @ $13. Not sure about S&H though. I've also heard that if the key is a magnet you MIGHT be able to use another magnet to complete the circuit. I'm going to try this when I get home to tide me over till I get my next check and order a new key.

If there seems to be a slight knock when engine is Idling,
rod bearing may be going bad. or camshaft bearing.

If you want to recharge a "new" battery you should use a trickle charger and leave it on over night. Remove the ground side wire from the battery before charging. let us know

Norelco 725 RL electric shaver replacement cutter heads is Norelco HQ56 shaving heads.

Your problem is that a magnet has fallen off. Here's an illustrated guide that should make fixing it easy: http://fixmytreadmill.blogspot.com/2010/10/how-to-fix-treadmill-e1-error.html

Good luck.

Starla Oldham

It appears that there is no manual listed online, but I think that is because you are reading off the DL 5.21 from the controller and that is just the controller model which is made by an electronics company not Merits. The models start with 'P' and 'R'

Power Wheelchairs - Merits Health Products

meritshealth.com https://www.meritshealth.com > power-wheelchairs

Power Wheelchairs. Product Category. Show All. Folding/Portable. Front Wheel Drive. Mid Wheel Drive. Rear Wheel Drive. AVID Mid Wheel Drive.
‎Folding/Portable · ‎Accessories · ‎AVID Mid Wheel Drive

Merits Health Products: Merits Home

Merits Health Products https://meritsusa.com Feb 10, 2023 - Merits Health Products has multiple categories of power chairs: portable, standard, and heavy duty. Scooters. Merits Health Products has ...
‎Contact Us · ‎Our Products · ‎Resources

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  Power Chairs

  https://meritsusa.com > Our Products
  Power Chairsmeritsusa2023-05-12T14:15:44+00:00. Portable Chairs. Travel-Ease. EZ-Go. Junior. Vision CF. Standard Chairs. Vision Sport ...

https://www.google.com/search?q=Merits+DL+5.21+manual

S246 manual here

https://www.yumpu.com/en/document/read/36678740/s246-owners-manual-merits-health-products

Batteries are normally 2 x 12 volt 20 amp hour (AH) for the outdoor scooter type. Indoor wheelchairs take one.

..

sounds like a timing issue

Here's how in 4 easy steps (I substituted "A" for "X", my more favorite variable.):

1.) Set calculator to "Degree"
2.) Given-- (cos( X))
3.) Given--(4.37/7.25)==> (437/725)
4.) Add--(cos( X)+ (437/725)