"iain_b" wrote in message
ups.com...
Hi all,

I've got a British Gas boiler, Model 50F2 (made by Potterton).

When I try to put the radiators on - nothing happens. When I try to
put the hot water on - both the hot water and radiators come on. The
boiler is 7 years old and the problem has just started, is there
something sticking?

Not necessarily the only answer but the symptoms can be explained by a
faulty heating zone valve, either synchron motor or microswitch.

Jim A