Landice L Series Diagnostic And Service Manual page 94

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Finally, in the rarest of cases, on home treadmills, a faulty relay board can cause an OS. To
verify this, using a digital voltmeter, and with the treadmill turned on, measure the DC voltage
between V+ and P1 on the PWM board. The reading should be between 6-7VDC. Also measure
the DC voltage between P1 and P2 on the PWM. The reading should be between 0.5VDC and 6-
7VDC. If either of these voltages measure zero the relay board needs to be replaced.
PO- Elevation Potentiometer is out of range. See Flowchart for PO
The following codes apply only to mills with SCR Control boards
CE- Communication Error resulting from upper/lower board failure or harness connection problem.
When in Diagnostic mode and an error is detected the following codes will appear:
ERR 1- Upper board Ram error. Replace board.
ERR 2- Upper board ROM error (try replacing E Prom)
ERR 4- Upper Board NVRAM error. Replace board
ERR 8- Upper board serial port pin error (check harness connections)
ERR 16- Communication Error
Note: If two or more errors are detected, the code will be the sum of the individual error
codes. Example: Err 12= Err 8 + Err 4