Hello. Got a similar problem (on a Melitta CI), maybe who can help.
It started with system error 5 and the thermal fuses on the heating block were defective.
Now here's what I've done:
Instead of a thermoblock a bulb is connected and instead of the NTC in the thermoblock a potentiometer. By this simulation I could recognize that the original problem, that the thermoblock overheats, is unfortunately still there. Light bulb (simulation Last Thermoblock) lights up constantly, although temperature (simulation Poti) has been reached for a long time and coffee is prepared (of course cold, because of the simulation). Actually, the light bulb should go out after reaching the temperature, or at least after making coffee when the machine is in standby. The light bulb shines all the time.
Suspicion of the triac that supplies the thermoblock.
I desoldered the Triac BTB12-600BW and tested it with a small circuit on a DC voltage. The triac switches as soon as I apply voltage to the gate, I disconnect the voltage from the gate, then the triac switches off again, normally, the triac should remain switched through after all (at least with DC voltage, with AC voltage the behaviour would be correct).
The big question now is: Is the triac defective or is it a problem on the circuit board?
I ordered a triac once, but if it's not that....
Has anyone had the problem and can answer the question?
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