Landice L8 Cardio trainer giving messages on readout P4 and L5

that is a loss of speed error. you only get rid of it when the belt starts moving again

I’m happy to help further over the phone at https://www.6ya.com/expert/howard_079189dd4959a511

this a problem in 2 ways:
1) test the input voltage motor, if there are the motor need repair.

2) test the output voltage board, for input voltage motor, if there are NOT the board is faulty.

see the block diagram atached.

Here is another source for the Landice L7 cardio treadmill key.

It is either the control board or the overlay. I would think it is probably the start button on the overlay that is stuck. The solution is to replace the overlay.

is a speed sensor problem or the card connectors are wired specifically where the motor wires, sometimes that part is too hot and breaks the solder

Check wall outlet for power , then if outlet is good unplug unit remove motor shroud you will see a charcoal or white ceramic fuse check it if open replace blows again immediately you have a shorted lower board. Here is the info Landice they help you with parts and get you in touch with a servicer if you need one.

Landice, Inc.
111 Canfield Avenue
Randolph, New Jersey USA 07869
(800) LANDICE
(973) 927-9010 - FAX: (973) 927-0630
[email protected]

first screen shows any error number? for what you describe I think it is simply speed sensor, try to check the cables leading to the sensor card. and then checks whether the sensor is aligned correctly.
Check speed sensor alignment.
It should be within 1/16" of the flywheel
and parallel to the flywheel.
Is it out of position?

What do you think--what changes when something happens???

LS Error on Landice L-Series Treadmills with Belt Movement Probable Cause A LS error on the Landice L-Series treadmills can also look like L5 and this error code means there is a loss of speed signal. This error can occur with belt movement but speed will not increase. Causes for the LS or L5 error with belt movement are:A) Speed sensor is out of adjustment
B) Speed sensor is damaged or faulty
C) Display cable is damaged or faulty
D) Improper speed control wiring Corrective Action A) Speed sensor should sit parallel with the flywheel and gap between speed sensor and flywheel should be within 1/16". Adjust speed sensor if necessary.
B) Inspect speed sensor connector to relay board. Check for pushed pins or loose wires. Repair or replace speed sensor assembly if necessary.
C) Inspect upper harness or display cable connector to relay board. Check for pushed pins or loose wires, giving specific attention to pin 5 (brown) and pin 9 (green). Repair or replace display cable if necessary.
D) Inspect speed control wiring:

1. Checking purple wire from V+ on pwm board to P3 on the relay board
2. Checking orange wire from P1 on pwm board to P1 on the relay board
3. Checking brown wire from P2 on pwm board to P2 on the relay board
4. Confirm P3 on pmw board has no connection

Correct speed control wiring if necessary.
Details about LS Error on Landice Series Treadmills with Belt Movement

LS Error on Landice L-Series Treadmills with Belt Movement Probable Cause A LS error on the Landice L-Series treadmills can also look like L5 and this error code means there is a loss of speed signal. This error can occur with belt movement but speed will not increase. Causes for the LS or L5 error with belt movement are:A) Speed sensor is out of adjustment
B) Speed sensor is damaged or faulty
C) Display cable is damaged or faulty
D) Improper speed control wiring Corrective Action A) Speed sensor should sit parallel with the flywheel and gap between speed sensor and flywheel should be within 1/16". Adjust speed sensor if necessary.
B) Inspect speed sensor connector to relay board. Check for pushed pins or loose wires. Repair or replace speed sensor assembly if necessary.
C) Inspect upper harness or display cable connector to relay board. Check for pushed pins or loose wires, giving specific attention to pin 5 (brown) and pin 9 (green). Repair or replace display cable if necessary.
D) Inspect speed control wiring:

1. Checking purple wire from V+ on pwm board to P3 on the relay board
2. Checking orange wire from P1 on pwm board to P1 on the relay board
3. Checking brown wire from P2 on pwm board to P2 on the relay board
4. Confirm P3 on pmw board has no connection

Correct speed control wiring if necessary.
Details about LS Error on Landice Series Treadmills with Belt Movement