Ohoh... that can be anything from the boiler to various thermo sensor fuses control electronics, I guess on the electrolytic capacitors.
measure everything for the first time so measure boiler if it has about 50 ohm, measure the resistor, should have about 125 ohm(meter on 200 places), thermo sensor kty10 should have at 20° so about 1.9 kiloohm(meter on 20 k places)
if this is ok, go on on on the power board, elkos will not be able to measure it needs another measurement, I would exchange on suspicion.Is certainly no mistake, because the things age relatively fast, but then take the 105° with no 85° br>not working then still, the next suspects would be the heiztriac at the cooling plate (the small bta12-700sw) the heiztriac can check with the multimeter, it could also be the relay and and and, good luck in the search
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Alle Tips und Hinweise erfolgen nach bestem Wissen - die Verantwortung trägt jedoch der Ausführende.
Daher bitte lieber einmal zu viel als einmal zu wenig fragen.
Vor allen manuellen Arbeiten am Gerät den Netzstecker ziehen !
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