My vision treadmill T9800HRT when start shows speed stall and error 7

Data Cable issue.

Large Data Cable Symptoms 1. E2 (T9200 & T9250 ONLY) 2. E5 3. E6 4. E9 5. No Elevation or speed function 6. No Elevation 7. No Speed 8. Deck goes to max at start 9. Run away speed Small Data Cable symptoms 1. No power to the upper board 2. Loss of power to the upper board, intermittent shutdown To troubleshoot a bad large data cable for most models - Enter engineering mode (see engineering mode for specific treadmill). If the elevation window in calibrations reads 000 in Px there no signal from the lower board to the upper console.
https://content.johnsonfit.com/inc/uploaded_media/4827226804f82ae5476352ddf9051547/troubleshooting_guide/87fc08ffe3e0caa8a9d3a1b15d59e71d.pdf

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If you wish to get some details about treadmill repair ; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/

Precor Error Code 26 Error Code: 26 Manufacturer: Precor
Model: All Models
Error Description: Error 26, Motor Pulse Width Incorrect - Observation of the speed sensor signal and verification the signal from the speed sensor is appropriate for the requested speed. If an incorrect or erratic speed sensor signal is detected the error appears. Possible Reason:

1. The line of sight between the speed sensor and the speed sensor target is obstructed.
2. Incorrect gap between the speed sensor and the speed sensor target.
3. Incorrect adjustment of the speed sensor potentiometer (when equipped).
4. Damaged speed sensor target.

Recommended Action:

1. Using a static safe vacuum cleaner, carefully vacuum out the drive motor compartment. Be sure to thoroughly clean the area between the speed sensor and the speed sensor target.
2. Inspect the gap of the speed sensor to the speed sensor target. Proper gap is 3/16" and the speed sensor photo eye should be aimed at the larger portion of the targets wedge shaped section. If unit has a magnetic speed sensor, the gap between the end of the sensor and the flywheel tooth needs to be 3/16".
3. Locate the speed sensor potentiometer (when equipped) on the lower PCA. Set the speed sensor potentiometer to mid-range. Start the treadmill and increase speed to 6 mph. Carefully adjust the speed sensor potentiometer until the treadmill is operating the smoothest. Increase the speed to full speed and again adjust the speed sensor potentiometer until the treadmill is operating the smoothest. These two adjustments are typically small and are generally only a matter of fine tuning.
4. Inspect the speed sensor target for any scratches or tears that could cause incorrect readings. Replace the speed sensor target if

Precor Error Code 26

Have to check the speed sensor. Either the speed sensor is faulty or the can be dust or speed sensor alignment.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

please see the 2 alternatives for error 7. God bless you

E7- 1) Alternative Elevation Motor
1)Cause: Elevation Motor not moving Solution:Check Elevation Motor connection
2)Cause: Elevation Elevation Motor screw binding Solution: Clean screw and lubricate
3)Cause: Elevation Motor Motor out of Range Solution: Check motor out of elevation
4)Cause: E-Motor Potentiometer: Solution: Replace Elevation Motor
2)Alternative:
Display Doesn't Light Up: a)Cause: On/Off switch Solution: Test unit is turned on b)Cause: Insufficient Power Source Solution: Plug dedicated120V, 20Amp Outlet
c) Cause: Line Cord Damaged Solution: Replace Line Cord
d)Cause: Fuse Solution: Check Fuse on MCB

see the comentary ERR1 indicates a speed issue. In this case, the motor speed as reported from the optic sensor differs
from the speed setting.
Analysis: Optic sensor signal issue -- Either the optic sensor signal is not right, or it is read incorrectly, or
the signal is not reaching the display.
Run the software calibration for easy diagnostic and fix it. God bless you

I have an HRT9450 that is showing an E4 error code - but when I run the auto calibration it doesn't seem to finish.

It runs up the speeds and back down but then stops without ever showing 'end'.

When i then take the safety key off and replace it the E4 error code shows again.

The treadmill was working fine until I moved it a foot and then the error code shows - meaning I'm suspecting a lose cable but I don't know where to start looking for it.

Any advice?

Error 22 - No Motor Pulses at Start Up
Description
Error 22 indicates that the drive motor (running belt) has been instructed to start, by either
manual or program control, and the monitoring system has not received any response from the
speed sensing system indicating that the drive motor has started.
Possible Causes
1. The treadmill utilizes an optical (infrared) speed sensor and the line of sight between the
speed sensor and the speed sensor target is obstructed.
2. Drive motor brushes are bad.
3. The speed sensor position relative to the speed sensor target is incorrect.
4. The speed sensor potentiometer adjustment is incorrect (when equipped).
5. The speed sensor is inoperative.
6. The lower PCA is bad.
7. The lower PCA to upper PCA interconnect cable is bad.
8. The upper PCA is bad

returned the machine and got our money back, thanks.