The C1 error is displayed when the motor tries to pull more than 26 amps to run.
This indicates a problem with the motor or motor controller.
Overloading or excessive suds can also cause this error.
If you like to make a few more checks then the image below contains the instructions for entering the diagnostic test mode.
Its a short cycle that runs all of the components so the operation of each can be checked.
I hope this helps but an intermittent C1 error can be hard to pin down.
From the service manual....
"C1 = Average current limit Or Instantaneous current limit.
If a status signal comes back from the motor controller that a current
limit has been breached, the unit will return to standby mode and
display either CA for average current limit trip or Cl for
instantaneous current limit trip.
Average current trip occurs if there is a 2 second average of current
draw greater than 5.55 amps
at the motor windings.
Instantaneous current trip occurs if there is a spike of 26 amps
instantly at the motor windings.
This may signify problems with the drive motor, thermal protector, or
motor controller. Over-loading the unit may cause this problem."
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