Error
44 - Un-commanded Lift Motion
Description
The lift control system has detected
that the lift is in motion without a lift command having been issued. This can happen in one of
two ways: either the lift drive circuit has failed in a turned on
condition or the lift position
sensor (lift position potentiometer or revolution sensor) is sending an
erroneous signal to the lift control
circuit.
Possible
Causes
1. Poor or intermittent connection
in the lift position sensor.
2. Bad lift position sensor
3. Bad lower PCA.
Possible
Remedies
1. This is the most common cause of
an error 44. Verify all wiring and connections associated
with the lift position
potentiometer. Repair or replace wiring or connections as appropriate.
Because of the nature of the
revolution sensor an error 44 is rarely associated with it.
2. Operate the lift in the
diagnostics while monitoring the lift position number being displayed.
The the reading is erratic and makes
large changes in readings the lift position potentiometer
is probably bad. Replace the lift
position potentiometer or the lift motor if it utilizes an internal
potentiometer.
3. If there is actual lift motion
without a manual or program control lift command having been
issued,
replace the lower PCA.