On 23 Jan 2007 01:31:46 -0800, "adder1969"
wrote:


T i m wrote:

On mine it was fairly easy to
check and/or hardwire all the sensor inputs to both give some
supervised heating and also to see where the problem was.

I had thought of doing similar but without any idea what goes on in
the control unit (and therefore the in / output logic) I didn't want
to make anything worse.


If the control unit is very simple it will just switch open the gas
valves and it's usually easy to bypass the controller so that happens
if you're desperate for some heat and hot water. You just need the fan
and the flame (and the pump) and away you go. It's no fun hurrying to
fix a boiler in a cold house so I usually get the house nice and toasty
first before actually fixing stuff. ...although having said that some
people frown at an open boiler with a few wires hanging out of it :-)

They also probably feel the same about a live PC just sitting uncased
on the bench ;-)

I did say the boiler seemed to be running ok with the 'replacement'
control unit, well it was as of midnight last night at least.

This morning I got a phone call saying the boiler was now 'not working
again'. ;-(

A quick look showed that the boiler was indeed 'dead', as in it now
does nothing at all?

They had to go out (more chemotherapy for him) and when they come back
I'll have probe about and find out where all the power has gone (the
controller suggests the system has power but the isolator on the
boiler isn't an illuminated one so I can't tell if power is getting
down there or not).

It may well just be the 20mm / 1A fuse on the controller has blown (as
they can sometimes do for no *apparent* reason) so I'll see how long a
replacement fuse lasts. If it runs ok I might measure the current with
the DMM and see how near the 1A it actually is?

Ho hum .. back into the frying pan .. ;-)

All the best ..

T i m