My washing machine had the same symptoms as this one, which is the same make but different model. It suggests a bad tacho. I need more certainty before buying parts.
The state worsened. Now I just get a non-stop continuous blinking LED with all flashes evenly spaced (thus no error code).
Someone told me the advice on this page is sketchy. IIUC, that page says to hand-spin the motor while the tacho is connected to an ohms meter. I get very little variation. If I give it a spin as fast as I can, it goes from 52 Ω to 52.8 Ω.. or 53 Ω on one occasion. Someone said it’s wrong or bad to puts current through an ohms meter. So is that a bad test?
voltage test
Some people apparently read the AC voltage of a tacho while spinning it. My meter only has 2 scales for AC voltage: 500 and 200, which are far too high to detect anything.
Hz test
My meter does not have Hz. Should I buy a meter with Hz?
Earphone test
I connected the tip of the 3.5mm phono connector for audio headphones to one tacho lead and the middle segment to the other lead. When it spun, it sounded in the right speaker just like the drum sounds to my naked ears as it spins. That can’t be right. Must be all in my head. Is this test useless?
Scope test
Apparently an oscilloscope app can be fed by a smartphone’s mic input. But I do not have an AOS 6+ phone.
compass test
I could theoretically run a compass app and hold the smartphone up next to the tacho as it spins to see if the magnet is still magnetic. But I’m told it’s unlikely that the magnet became demagnetized unless I sent 230 VAC to it -- (and I did not).
hotwire tests on other components
I hotwired the univesal motor to the mains (230v) and it spun fine. I also hotwired the drain pump to 230v and that spun fine. I also hotwired the water inlet valves to 230v and the water valves opened as expected.
what now?
I don’t understand why a tacho would go bad. So how should I test my tacho?
Ultimately I need to know what the PCB instantly thinks is broken. Is the PCB doing an ohms test to test the health of the tacho?