i have a similar problem. had a power outage and when the power was restored the doorbell would continuously ring, escalating in volume. i just unplugged it! any suggestions?
If you push the buttons (try both front and back doors) does the doorbell reset itself and then work normally.
A doorbell power failure indicator that causes it to ring continuously is not a good idea because no one might be home and the sound would give away the fact the house is unoccupied.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.