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It seems this has been happening over the last few years. I am a retired appliance tech. My 1870 also started the 59 second routine, Also in a motor home. Pure logic. Had to be the board. New board same results. So now I need to run down a parts manual and possibly service manual, and get the damper switch and motor refered to in earlier posts. Changing out the board was fairly simple. Dropping the unit to change out the other components sounds like it will be a tad bit more difficult.
Maybe there's a problem with the power transformer or the power PCB [ Printed circuit board ] . Or it could be just a fuse . You need to check first . If it's the fuse , then that will be easy to solve , you need only to replace it with new one . But if the problem is with the transformer or with the PCB , you need to take your microwave to the service for repairing .
To locate the fuse, remove the outer cabinet of the unit, which is usually held in place with a few screws. Once the outer cabinet is removed, follow the power cord into the unit. It will take you to the fuse holder, where the fuse sits. The fuse holder is located two or three inches into the unit, and may be attached to a power board .
If it's not the switch or mount, you may need to adjust the door alignment.
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the unit, and requote your symptoms, as you posted previously.
What i will tell you concern only certified technician. do that to your own risk . Unplug the microwave oven, open the cover , then follow the cable from outlet, you will check that cable with meter , if that cable is good , you will see a fuse inside attached to one of the power cable. Check again this with ohmmeter. ...