The resistance across the boiler elements should read about 14Ω, not
zero. Make sure your multimeter is set for the appropriate range, and
measure with the power off.
Next steps would be to test voltages at various points. First, let the
machine warm the steam boiler up and wait until the steam light goes
off. Then measure the voltage at the brew element. On a working machine,
one side should read 0V and one side 110V. If you get no voltage there
check the output terminals of the solid-state relay. There's an LED
built in to the SSR which should be on too. If the LED is on, both sides
of the SSR should read 110V. If not, then the PID controller is not
signalling for power, which could be due to a bad sensor or bad PID.
Hope that helps,
Bruce
On 3/21/15 11:41 AM, brewcru wrote:
Yesterday the stream boiler pressure relief valve blew and released a
large volume of steam into the machine. The PID controller display had
visible moisture in it. The machine power-off due to GFCI tripping.
BTW, my machine is a Brewtus III Rotary with blue PID display.
I think the steam boiler pressure stat got stuck and that caused the
blow out. I replaced the pressure stat ~18months ago. During my
trouble shooting this morning, the pressure stat and steam boiler seem
to be functioning correctly. I turned the pressure stat down slightly,
that may have "unstuck it".
I have traced the issue to the brew boiler. The controller and
pressure stat are both indicating that current should be applied to
the brew boiler but I am not registering any voltage on the brew
boiler (and it's obviously not heating). I am getting 110VAC on the
steam boiler when the pressurestat opens.
Some additional info... When I fired the machine back on after the
blowout the PID controller read "A1", which apparently is a general
error state. I thought it might be the temp sensor, so I open the
machine and wiggled the thermocouple leads on the brew boiler and it
started reading again, or it just dried out and started reading again.
I have not looked at the schematic yet, but it looks like the PID
controller opens a relay just below it that should put 110VAC on the
brew boiler, but it's not applying any current. What could be the
problem here?
The brew boiler and steam boiler leads are both reading zero ohms.
Thanks for any help!
-Frank
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