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Date: 16 Nov 2006 15:09:11
From: Joe Donnelly
Subject: Boiler over filling
Problem with a two group semi, plumbed in to uk mains (plenty of
minerals). Have cleaned level probe and it is conducting fine.Also there
is continuity through probe wire to autolevel. The thing I find strange
is when I touch the top of the probe the filling stops, take finger of
and filling starts again. So why wont it stop when water reaches probe?
The auto level is a gicar with pins that plug into a base sorry i
haven't got serial number where I am at moment. Have ordered a new auto
level, but am not convinced it will fix the problem as the old one is
able to stop the filling when probe touched by me.
Just wondered if any one had expeirienced similar problem without it
being down to a faulty autolevel.




 
Date: 16 Nov 2006 13:06:57
From: Jack Denver
Subject: Re: Boiler over filling
Unplug line going to the probe wire from the probe. Autofill should start.
Jumper between line and boiler - autofill should stop. Jumper between line
and a known ground -autofill should stop. Let us know if machine does not
behave in this way. Also check for continuity between boiler and electrical
ground.


"Joe Donnelly" <joe_t.donnelly@ntlworld.com > wrote in message
news:ra%6h.1362$d4.277@newsfe4-win.ntli.net...
> Problem with a two group semi, plumbed in to uk mains (plenty of
> minerals). Have cleaned level probe and it is conducting fine.Also there
> is continuity through probe wire to autolevel. The thing I find strange
> is when I touch the top of the probe the filling stops, take finger of and
> filling starts again. So why wont it stop when water reaches probe?
> The auto level is a gicar with pins that plug into a base sorry i haven't
> got serial number where I am at moment. Have ordered a new auto level, but
> am not convinced it will fix the problem as the old one is able to stop
> the filling when probe touched by me.
> Just wondered if any one had expeirienced similar problem without it being
> down to a faulty autolevel.




  
Date: 16 Nov 2006 20:04:32
From: Barry Jarrett
Subject: Re: Boiler over filling
On Thu, 16 Nov 2006 13:06:57 -0500, "Jack Denver"
<nunuvyer@netscape.net > wrote:

>Unplug line going to the probe wire from the probe. Autofill should start.
>Jumper between line and boiler - autofill should stop. Jumper between line
>and a known ground -autofill should stop. Let us know if machine does not
>behave in this way. Also check for continuity between boiler and electrical
>ground.
>

and continuity between probe and boiler.



 
Date: 16 Nov 2006 11:06:29
From: Dan Bollinger
Subject: Re: Boiler over filling
> Problem with a two group semi, plumbed in to uk mains (plenty of minerals).
> Have cleaned level probe and it is conducting fine.Also there is continuity
> through probe wire to autolevel. The thing I find strange is when I touch the
> top of the probe the filling stops, take finger of and filling starts again.
> So why wont it stop when water reaches probe?
> The auto level is a gicar with pins that plug into a base sorry i haven't got
> serial number where I am at moment. Have ordered a new auto level, but am not
> convinced it will fix the problem as the old one is able to stop the filling
> when probe touched by me.
> Just wondered if any one had expeirienced similar problem without it being
> down to a faulty autolevel.

Autofill stops when a circuit is closed (I) between sensor and ground via the
water. Remove the water, circuit opens (O), autofill starts. Water rises, closes
the circuit (I), autofill stops.

Problem is, your circuit is not being closed. When you touch the probe it
closes. Your body is providing the ground. Therefore, something is amiss with
your ground. Try touching the boiler; if the autofill stops, then ground your
boiler.

I am not familiar with your style of sensor. If it has pins, is one supplying a
ground?

Dan



 
Date: 16 Nov 2006 07:35:52
From: daveb
Subject: Re: Boiler over filling
Is the insulation at the probe fitting OK?

i.e. is it leaking current?

I'd try a complete new probe w/ fitting first! cheaper!

just a guess.

dave