Andy Hall wrote:
On 2007-07-11 00:54:55 +0100, John Rumm
said:

The Natural Philosopher wrote:
Matt wrote:
On Tue, 10 Jul 2007 17:00:05 +0100, Mike Barnard
wrote:

My Worcester Bosch boiler cannot be activated by external zone
controls. So says the techie's at WB themselves. I've spent hours
and hours and a couple of hundred pounds doing the zone thing. I tried
to sort the controls today and couldn't figure out how to connect them
to the boiler. So I called WB tech support and my boiler (which is
only 2 years old FFS!" cannot take it. No way. "Can't I bodge a
control in somewhere?" Nope. The text display controls it all. There
is no single 'lightitupnow' connection in there.

What crap. WB Tech support are wrong.

What model boiler is it?


According to what I found, they are sadly correct.

There must be something that the TR2 can indicate that tells the
boiler it is getting a bit nippy in the room though, causing it to
turn on. So the next question is how to simulate that.

Easier solution.

Spend £45 on a TR2 and pull it apart. Either spoof the temperature
sensor (probably thermistor or semiconductor) or the rotary control if
it's a pot. A couple of resistors and a small relay should be able to
have it convinced that the room temperature is changing or being changed.

This avoids needing to break into the boiler and has much lower risk.


That was my thought too.