I get an E4 and E6 error message on my Vision T9600 treadmill when it starts...

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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I would consider buying another one. Although this seems expensive, it is the safest way to go.

It appears that your elevation system is where the fault lies. This could be as simple as recalibrating the lift mechanism, or possibly correcting faulty wiring from the lower controller to the lift motor. Be sure to check the condition of the lift motor as well as the wires entering the lift motor. Sometimes the wires will pull away from the plastic connector causing a lift motor error

Lube the treadmill for deck belt+roller bearing too.
This happen because the lack of maintenance schedule.
See the video, if after you fix it, the problem remain, is TIME to replace the old deck board.
God bless you

I am having the same problem, not E4 but E6 error code and have to keep resetting it and about 15 min later it start beeping the error code again? Please help

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?

You must measure the 8' 12 vDC Voltage to display from the terminal from Controller board motor.
If there are the Console Board is faulty. However tight very well and cleaned it with electronic spray cleaner.
If there are NOT, the controller board motor is faulty, some IGTBs are faulty. REPLACE
Blessing.
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How to Determine If Treadmill Console Is Broken

How do I get back to the basic treadmill....it popped up old programs

these are the most often used functions you just worn them out you can call vision fitness they will ask the upper console model and serial # (located on the back end of the console ) Here is their # 1-800-335-4348

E4: Solution 1. Check power to the treadmill, as insufficient voltage to the treadmill can cause this error to reoccur. Check the power socket that the tread is plugged into. Eliminate any extension cords or surge protectors (plug the tread directly into a functional power source). Make sure the circuit is not overloaded. Make sure the circuit is NON-GFI. 2. Calibrate (See engineering mode for specific treadmill). 3. If calibrations do not hold, replace upper console. Note: Usually simultaneous with an E6. E6: Solution 1. Check the elevation plug connection at the lower board. 2. Check ALL large data cable connection at the lower and upper boards. 3. Calibrate (See engineering mode for specific treadmill) 4. Test/change large data cable (use large data cable information provided in the data cable portion of this Guide). 5. Replace elevation motor E7/E9: Solution 1. Certain lower boards have an LED that flashes when the magnet on the roller passes the sensor. Adjust sensor position if LED does not flash. See lower board basic troubleshooting for lower boards with the LED. 2. Unplug RPM sensor at the lower board. Check continuity. Treadmill will operate without sensor but cannot Autocalibrate. Calibrate manually. 3. Replace RPM sensor TREADMILL.TROUBLESHOOTING. AUTO CALIBRATION STEP 1 ENTER ENGINEERING MODE • With the SAFETY KEY in place, hold the “ELEVATION UP” and “SPEED DOWN” buttons for 5 seconds. “DGA3” will appear in the profile window and “EHG1” will appear in the function window. • You are now in ENGINEERING MODE STEP 2 ENTER AUTO CALIBRATIONS • Press the “ELEVATION UP” or “SPEED UP” to “EHG4”. • Press “SELECT”. STEP 3 • Press “START”. The treadmill will calibrate itself. This will take about 3 to 5 minutes. When AUTO is complete, “END” will appear in the window. Wait 10 to 15 seconds and the treadmill will reset itself to “P1”. STEP 4 • Press “START” to test the treadmill