I'm wondering if you can help me. I rebuilt a Nuova Simonelli Appia with volumetric dosing and I am now at the point where I'm putting it through its paces. I noticed the power button is stuck in the "on" position, a few of the LEDs are not illuminating including the one over the power button, and when I first started the machine the pump motor would continue to run after the autofill probe had shut off the autofill solenoid. I had to unplug the machine a few times to make this symptom disappear. The machine will continue to heat whether the keypad is plugged in or not. All other functions are normal including the pressurestat, it will cycle the element on and off according to boiler pressure.
I was very careful to only remove as many wires as was required to remove the harness from the frame. Everything was labeled, and put back in its proper place. It is possible a wire may be crossed but everything matches visually to the photographs I took before disassembly.
I wonder if anyone knows how I could narrow the problem down to the keypad or control card, and what points to check with my meter. The pump was seized when I bought the unit, so I did not run it up completely before disassembly, but I'm pretty sure the power button worked as it should. Also, is there anywhere I can send either the keypad or control card for repair, or am I stuck buying new units. Thanks very much
Thanks, I think I may have zapped the cards when installing them into the machine as it was sitting on a stainless sideboard when I did it and there's a chance I touched the card or a wire to it before grounding myself on the sideboard. Here's a look at the card, anyhow. Thanks
Have you checked to see if the control panel cable is completely plugged in at the panel side (underneath the plastic cover on the backside)?
Also what do you mean the button is stuck in the 'on' position? The model I have just has a plastic overlay with momentary switches underneath, there would be no way for it to stick. I have seen newer appias with actual plasic buttons but I beleive they just sit on top of momentary switches. If you have the newer plastic button model it could be that there is plastic flashing on the button or something and it's just sticking. That being said, have you tried operating the machine with the control panel buttons detached from the front? Perhaps the power button sticking is causing the problems with the rest?
Looks like the control board is a $350 part, it would be a shame if it was actually the cause.
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