I brought my M29 to the local dealer for repair. the motor and pump didn't work. the boiler and switches did. after 4 hours of work a was told that the CPU was bad. a new one was $2,000. it didn't seem right that some things worked and some didn't if the CPU was out but what can i do. HELP
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M29 is a semi automatic machine. Wiring is straight forward with the normal variance for single phase and 3 phase. Sorry i don't have a digitized diagram on hand. Maybe later. Dosing, is done with the control board which will need replacement if its not working.
From your description it sound that the button strip need to be replaced. All the buttons of the coffees and also for hot water are all set in one unit the button strip. This like a membrane and is located under the buttons. This is frequent problem with m29 select since the connector of the button strip it is exposed under the cup warmer area and is very easy to absorb the humidity from steam escape inside the machine and when one short circuit it happens then since the whole strip is one unit it will mull faction as you described.
The price for the m29 select new is about 5500 to 6000. So for one of 4-5 years you can give about 2500-3000. However I sugest to open the machine and check if their are rusting points or any leaking points which propably be white points from calcium color. Also ask if their were any water filter like everpure or and a water softener conected to water supply of machine during the operation of the machines.
If you see minor points as above and the water was treated before entering the machine then your machine can work for minimum another 10 years.
Water calcium (scale) is the biger enemy of the machine.