Re: Nuova Simonelli trouble shooting (redux)

Check the resistance on the heating element between the terminals, not just
continuity. It should be a few 10s of ohms depending on element size and
voltage (according to V =IR). For example, in a 240V machine, 2400 watt
element pulls 10A. (watts = 240Vx 10A)

for resistance, 240V= 10A x 24 ohms. Now the element might not read
precisely 24 ohms - it might be 20 or 30, but if it is wildly off from the
predicted value something in wrong.

And check for resistance between the terminals and boiler with the element
installed and boiler filled with water - it should be infinite. Your
continuity tester might not pick up on a high resistance path and the
behavior of the element dry outside the boiler may be different than when it
is fitted.



"Robert Harmon" <r_h_harmon@xxxxxxxxxxxx> wrote in message
news:IaEIh.8477$PL.4828@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
OK, I've found the blockage keeping the autofill from working. While I was
locating & fixing that I had a brain fart - take the boiler apart &
descale *everything*. No problem: EXCEPT (isn't there always one of
those?) now the heating element causes the circuit to trip. It's probably
something simple or it may be electrolysis caused enough metal to build up
to short the posts. ???

Here's what I did;
1) Descaled elements in hot acidic solution, keeping water level below
exterior edge of mounting flange - so no plating probably occurred there.
2) Reinstalled element using new Teflon gasket & RTF sealant.
3) Fired up machine & tripped the circuit.
4) Disconnected element & everything else worked fine.
5) Reconnected element & tripped circuit.

So the problem IS in the element that worked fine before I fixed it. Any
suggestions on what went wrong?
--
Robert (Old rule, too often ignored: If it ain't broke, don't fix it!)
Harmon
http://tinyurl.com/pou2y
http://tinyurl.com/psfob
http://tinyurl.com/fkd6r




.

Relevant Pages

  • Re: Windows dont Work
    ... "Inspect the continuity between terminals". ... Some meters have a continuity check function, where they make a tone when ... then measure resistance between the 2 terminals. ...
    (alt.autos.toyota)
  • Re: Static noise - grounding problem
    ... There doesn't seem to be any voltage difference between the two. ... When you check for a voltage between two points, the meter provides no ... When you check for resistance, the meter provides a voltage to the circuit ... What you want to check for is continuity from one point to another. ...
    (alt.guitar)
  • Re: Microwave advice
    ... So I have an older GE JVM1190 over-the-stove microwave unit. ... residual voltage on either of its terminals. ... infinite resistance from either ... The push-on wire connection to the interlock switch had developed ...
    (sci.electronics.repair)
  • Re: Microwave advice
    ... connectors to the magnetron were somewhat oxidized and did not make ... residual voltage on either of its terminals. ... First I "tested" the magnetron: infinite resistance from either ...
    (sci.electronics.repair)
  • Re: How does one find employees, including trainees?
    ... continuity is "0" resistance to current flow. ... other lead, if that isn't ohm's law, what is? ... voltage or amperage when the other two elements are given. ...
    (alt.security.alarms)