On 24/11/21 2:36 pm, billherbst wrote:
Having replaced the pressure switch numerous times on both my old
Brewtus II and now my Brewtus IV-R, I keep new replacements on hand.
So, after letting the Brewtus cool down some, I swapped out the
pressurestat in the machine and hooked up a new one. Easy-peasy,
right? Wrong.
Turning the Brewtus on again, the steam pressure rose to 1.2 and just
kept going. So, if the pressure switch isn't the problem, what is? Why
is the heating element in the steam boiler not shutting off?
Having already had a problem last year with scale causing the refill
valve to stick, I'm wondering if I have another malfunction due to
hard water scale. Is that the likely culprit, or has something else
failed?
OK - I'd suggest you have scale blocking the pressure path to the
switch... I'd put money on blockage on the U shaped tube that goes up
to the switch. If the pressure continues to go up, the controller and
the rest of the gubbins have nothing to do with it. The pressure is
100% controlled by the pstat. A new one exhibiting the same behaviour
tells me the fault lies on the pressure sensing side - the tube. You
probably need to remove it and see. Blowing through would be reasonably
diagnostic (although a flap of scale COULD be there and not show, I
guess...). Where it attaches at the top of the boiler is also in need
of checking and I'd suspect it is the most likely point of scale
deposition (it's the hottest spot....).
You probably have 2 good pstats and machine with a scale problem would
be my most likely suggestion..
Cheers
/Kevin
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