Roger Mills wrote:
In an earlier contribution to this discussion,
Andy Champ wrote:

PCPaul wrote:
Is this one advantage of a combi? We've had the CH side of it
switched off for months but at least the rest of it has been going
strong. OTOH presumably if the 3 way valve I assume it has inside sticks
it
isn't going to be a local plumbers merchant job to fit my own
spare...
Is this one advantage of a conventional system? We've had the CH side
of it switched off for months but at least the rest of it has been
going strong.

Presumably if the 3 way valve in the airing cupboard sticks it's going
to be a local plumbers merchant job to fit my own spare...

P
Andy

Not necessarily. You can often free them by removing the actuator and
turning the valve spindle with a pair of pliers.

When I had a Y-Plan system, I used to exercise the CH every day in the
summer in order to heat up the bathroom radiator for an hour to warm the
towels (all other rads turned off). This made the valve much less likely to
seize.

I take it that that carefully chosen minimal edit was a waste of effort
then?

Andy