I picked up an old used U3 the other day from someone that took it out of a racetrack or something. Didnt know if it worked. Got it cleaned up & today I started trying to get it working. Main problem is turning it on & turning up the thermostat & the contactor starts yelling. Ive tested the voltage coming in, the limit thermostat, the contol thermostat & everything seems to be working fine. Continuity is fine on the control thermostat & contactor. I even bypassed the control thermostat & still had the yelling. So Im assuming the contactor is maybe blown & its fine when the thermostat is set to off & the continuity is fine but when its under a load it doesnt work. But would there be anything else causing this? I havent determined that the heating elements are working (about to try bypassing the contactor & see if the heating element at least acts like its working). Anyone have any insight? I had this same problem on a previous machine about 6 years ago but I cannot remember the fix. Cant remember if I replaced the contactor or something else. I know I've replaced plenty of limit thermostats & control thermostats on Bunn coffee makers & heating elements on different espresso machines & coffee makers but I cannot remember what I did to fix this contactor yelling.
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