Question about Coleman 805D712T
Black= power wire - red= power wire+ blue= a/c control orange#1= thermo orange#2= common
Posted on Dec 13, 2007
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Now in terms of what can cause this (as the manual does not explain the reason for the fault in my case) ... at first I thought it was the Brew Unit getting sticky and thus too hard for the motor to return the unit to its home position. The motor is actually very strong due to internal gearing and this is unlikely to be the problem unless it's very stiff. In my case it turned out to be one of the two reed switches on the back of the motor drive was very slightly worn (it wears out because it drags on a cam) and this prevented the motor drive from stopping at precisely the right position during the sequence. This then resulted in the machine getting confused about what state the brew unit is in and so it says F73 . The two reed switches that control the Motor drive are accessible from rear of machine by removing the black cover of the motor drive. I can't recall which one was at fault for me .. but if you operate the machine with the motor drive cover off ... and then reproduce F73 ... you can actually see that it has not stopped in the right place on the reed switch and then you can work out which reed switch is causing the problem (also refer to manual which has a good explanation of states). There are two other read switches in the machine of the same type and these are not critical in terms of the wear issue so you can swap these over for the brew unit ones. Alternately you can buy new ones. It's a simple job just to replace them and the Miele service person would probably do it in 10 minutes. Now problem is fixed.
Now if you're doing this yourself ... you should also do some servicing at the same time;
1. Apply grease to the cam that controls the reed switches (this will prevent wear of the reed switch buttons).
2. On the back of the Brew Unit at the top .. there is lever that has ridges on it that activates one of the other reed switches (grinding amount compensation). Apply grease to this. (This can also stop an annoying clicking sound each time you brew coffee).
3. Apply grease to O-ring on the spout of the coffee on inside of door
4. Clean back of machine with vacuum cleaner and then with warm water .. it get fairly dirty. You can take pieces off to clean more thoroughly
5. If your technically skilled .. remove the Brew Unit Drive .. disassemble, clean & re-grease. After 5 years or so its gets dry and you do not want to have to replace this unit. WARNING: Note position of cogs and the cam before you disassemble (ie take pictures) and make sure you put it back in the same way. I did not do this and I broke the plastic cam .. which is designed as a weak link so that metal gears inside motor and brew unit drive are damaged.
Finally ... coffee machines are high maintenance and even Miele ones break-down. Miele spare part prices are very high but what I like about this machine is that it is designed to be serviced.
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