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Proform 725 treadmill - error code"PO" and "E21"

Started out intermittently, now I can no longer operate the treadmill without immediately getting the error code.

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  • tompuzio Jan 26, 2009

    I have same problem. Treadmill starts, but after 5 sec stops and E21 error message appears

  • 3113 Mar 02, 2009

    Error code 22 - lights will go on - belt will not operate. - Environ 1500 Treadmill



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Check there is controller inside on which there is DZ1 and DZ4 diodes which usually get damaged/burned out. I dont know values of the diodes but replacing them would solve the purpose.

Posted on Feb 14, 2009

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Have a e2 problem on proform725lt belt dosen't move

Posted on Mar 01, 2010


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1 Answer

E21 keeps appearing on console on horizon adventure 4 treadmill

If you wish to get some details about treadmill error codes and troubleshooting ; check the site linked here. Pull up older posts.

Nov 14, 2016 | Horizon Exercise & Fitness

1 Answer

Proform 6.75q Hi, I have bought the above treadmill off ebay but not yet collected it. The seller had said in moving it for collection the display no longer works, other than that still ok. Can this be...

Without the display you cannot use the treadmill properly.
Your guess in the cost to fix is good as mine as we don't know what caused the fault.
If it was me I would get my money back unless you can get it for a lot cheaper.

Mar 03, 2013 | Exercise & Fitness

2 Answers

Error 0 problem

see the error +causes +remedy:God bless you

Errors 00 through Error 04 check upper PCA memory locations, RAM memory locations and
EEPROM checksum during the power up test sequence. If a fault is found during the power up
test sequence, the appropriate error code will be displayed.
Possible Causes
1. These errors messages almost always indicate an upper PCA problem when they are
consistently displayed. Failures causing these error messages to be displayed are rare.
Possible Remedies
1. If the error message is consistently displayed when the unit is powered up, the upper PCA
should be replaced. It is possible to see one of these messages displayed intermittently due
to external causes. If the units A.C. input significantly dips during the power up test sequence
the test could fail resulting in one of these messages being displayed. Treadmills operating
on non-dedicated A.C. circuits may see these messages displayed on an intermittent basis.2_4_2013_5_52_44_pm.gif

Feb 04, 2013 | Proform Sport 1000 Folding Treadmill...

1 Answer

Proform 725 error code E22

Dear Sir:
The walking deck belt, had different speed that displayed in you display window.
Indicate stress in the motor by locked rotor.
Go to RUN the software calibration, for easy diagnose and troubleshooting.

Follow your steps in your user manual.If you do not have download for www. proform. com .

atached is diagrama for adjust the speed sensor. after RUn THE S. CALIBRATION.

sincerely. God bless you

ernesto cuadra
managua, nicaragua. c.a

Apr 04, 2012 | Exercise & Fitness

1 Answer

I have an older proform 785 treadmill thats giving a E21 error???

This is indication Powerfully that Main controller Drive Board is demanding Enough Current .
This indicate 1) walking belt is worn or 2) the drive motor brushes are worn.
3)Leaky filter capacitor 4) inductor or coil faulty.
You must use A clamp-on ammeter for determine the amount of A.C. input current being drawn by the treadmill under Load and Not Load.

See the Block diagram for knowledge how the main controller board has aprox 90% of function of the treadmills. Good luck.
Now you will have the Strong Results for trouble what is wrong!.

This block I did for Motivation Troubleshooting.


Nov 26, 2011 | Proform 785 Treadmill

1 Answer

Treadmill not working. Troubleshooting: Receiving E21 message. What does E21 indicate?

The E21 error code indicates that the console is not receiving a signal from the sensor that controls the speed on the treadmill. This means there could be a problem with the speed sensor. You may need to have a technician check the voltages on the power board and controller.

Nov 27, 2010 | HEALTHRIDER Exercise & Fitness

1 Answer

Error message E21

E21 means the treadmill is not picking up a speed signal once the start key is pressed. First, determine if the motor is turning before you get the E21 or not. If the motor turns, the speed sensor is the most likely problem. If it does not, you can manually turn the belt with your feet before you get the E21 and you should get a speed reading but eventually you will get an error code because it is almost impossible to keep the speed constant enough for the computer. Try running it through calibration with the motor shroud off.
Press the Stop and the Speed Up keys down while inserting the safety key.
Press the Stop key one time. The Time window should read EP:2P. Some newer models may also say FP, Pass, or the like. This means that it passes the EPROM test.
Press either incline key and the incline will calibrate automatically.
On this next step do not step on the treadmill when you press the Speed Up key and hold it down until 85 is shown in the Distance window (some models may show the 85 number in another window).
If the top speed of the treadmill does not match the displayed speed on the computer console, adjust the max speed potentiometer (pot) on the motor control board. This is the board that the red and black motor wires connect directly into in the motor area. The Max Speed pot is clearly labeled.
The max speed potentiometer is a small black square with a white center and is located near the three small speed wire connections labeled H, W, & L. Using a small insulated screwdriver adjust this potentiometer clockwise to speed up and counter-clockwise to slow down the max speed of the treadmill. A tiny turn of this potentiometer will make a big difference in speed so be careful when making adjustments.
It is not important to get the speed set exactly at the max speed of the treadmill but do make sure to get the speed within .2 MPH of the max speed of the treadmill. For instance if the max speed of the treadmill is 10 MPH, make sure to have the speed set between 9.8 MPH and 10.2 MPH. Some models have a 12 MPH top speed, so please check your manual if you aren’t sure.
After completing calibration of the speed, press the Speed Down key. The treadmill will automatically return to 0 MPH. Please allow the unit to stop completely before continuing, press the Stop key once and remove the safety key.
If the motor does not run, test the motor but first unplug unit then unplug the two leads ( Red and Black ) that is connected to the Motor Control Board.Cordless drill battery- get a fully-charged, 18 volt (preferred) cordless drill battery and on most treadmills connect the red and black motor leads to the battery (some have different colors but if you have two wires and get it hooked up backwards, the motor will just run backwards and won’t be harmed). If good, the motor should operate at about 1 MPH. Then Motor Control Motor will need to replaced

May 21, 2010 | Proform 785 Treadmill

1 Answer

I have a ProForm 625 and the belt has started to slide to one side. How can I fix it?

Check the rear end cap. (end where the adjusting screws for the belt are) check for cracking around the screws they have more than likely broken through the end cap and are no longer adjustable.

Nov 10, 2009 | Proform Weight Loss 620 Treadmill - 24755

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