"Ed Sirett" wrote in message
...
On Mon, 15 Oct 2007 19:15:27 +0100, bof wrote:

In message , Ed Sirett
writes
On Sun, 14 Oct 2007 16:41:32 +0100, bof wrote:

On an Ideal Response 120 combi, does anyone know what a flashing
"Central Heating" LED (behind the cosmetic cover) means? The symptoms
are the boiler won't light if the CH is on though the pump pumps the CH
water OK and the DHW works.


THE stock fault for this boiler is a leaking heat exchanger.
The usual presenting symptoms are that the boiler won't light because the
ignition is wet.

Thanks for the reply. The boiler lights OK when it's DHW, and the CH
doesn't get hot even when the DHW is running. I'm sure the pump's OK as
when I switch off the DHW there's a couple of seconds surge of hot in
the CH.

Firstly I'm sorry if I put you on the wrong trail here. You may well have
a model that has not yet eaten its heat exchanger (yet).

I don't have a manual for this model - what does it say?

Check the pressure vessel charge. This goes flat quickly on these models.
Check the system pressure. It has a low pressure switch, so if pressure low
problems. I'm not sure if it also has a CH flow switch, if so check this.