Possible explanations
The cause may involve the appliance, its connection or the electrical installation. Testing is needed rather than a remote part diagnosis.
Record whether the protective device trips on switching on, during filling or after the programme has been running. Note any visible leakage.
Work, charges, access and appointment availability confirmed before attendance.

Original illustrative scene · Not an exact manufacturer model or a completed-job photograph.
The cause may involve the appliance, its connection or the electrical installation. Testing is needed rather than a remote part diagnosis.
At what stage does the supply trip, and is any water visible?
Stop using it. Do not repeatedly reset the breaker, use an extension lead as a workaround or remove appliance covers.
A similar display or a familiar-looking front is not enough to use another product’s instructions. Send the actual label and message so the team can assess the enquiry.
Own model-label guideSend an observation, not a guessed replacement part. Prepare the model, symptoms and access details, then add them to your booking request.