Downstairs rads not getting hot

[Hodge]

Hi

I'm having problems with only one of my downstairs rads getting hot when
system comes on in the morning.
Gas board under service contract came and said I needed a powerflush (not
covered....there's a surprise) , had it done by local plumber (£200 cheaper)
he didn't find an awful lot of sludge, put system back on and all fine but
this morning problem has returned.

System (hot water and heating ) set to come on in the morning until 10:00
although hot water and upstairs rads fine the rads downstairs except 1 are
cold. If I switch heating back on after the 10: 00 they all come on lovely
and hot!!!


Gas board are coming back but not got a lot of faith in them, anybody got
any ideas please that I can throw at them

TIA

Hodge
(so far £400 for possibly un-needed powerflush lighter)

 

[John]

Hi


System (hot water and heating ) set to come on in the morning until 10:00
although hot water and upstairs rads fine the rads downstairs except 1
are
cold. If I switch heating back on after the 10: 00 they all come on lovely
and hot!!!

Sounds like unbalanced restrictor valves, someone may have twiddled. Turn
the upstairs rads off altogether using the valve at either end of the rad,
one end would need a small spanner the other end might be a thermostat,
then see if downstairs heats before 10:00. If so that's the problem,
especially if the upstairs ones do have thermostatic valves. These would
gradually shut down after 10:00 forcing the flow through the downstairs
ones. If not, haven't a clue.

 

[Hodge]

Second gasboard engineer has sussed it, hot water thermostat and possibly
valve duff, boiling hot water downstairs rads cold. Switch hot water off and
rads heat up as they should.

Thanks for your input.

Hodge