Combi boiler supplying a couple of taps and a lorryload of radiators on (I think) two circuits (err... that is the radiators are on two circuits).
Child turns tap on and is scalded by water that seems to me to be well above 60C (lots of steam etc.)
Fiddling with the "tap temperature" dial is interesting; the first water you get is scalding, but after a while it settles down to a lower temperature, related to the setting of the dial.
The boiler has a temperature indicator on the front under the flap; a row of neons or LEDs or something indicating up to 80C. After running a tap for a bit, they go down to 40C or 50C, but climb right up to 80C when the taps are closed.
Now I think this might related to the hot weather; the radiators in zone
1 *all* have thermostatic valves which are obviously, in this weather, not keen to pass any water. There is no obvious sign of a heat-dump loop. Zone 2 has a room thermostat which is again, obviously, off (indicating 25C this evening). The boiler (CH) is controlled by a timeswitch which no-one has seen fit to turn off, so is calling for heating, and the function switch on the boiler is also still selected for both heating and hot water.Is it possible that because there is a call for CH but nowhere for the heat to go that it's being dumped into the DHW? The boiler has a "preheat" function. If so, should we be looking to take the TRV off one of the radiators, or installing a room thermostat for zone 1? Zone 1, BTW has one "cold" area (entrance lobby), a corridor and several smaller rooms which heat up much better.
Or should we be looking at another fault?
I only thought to pose this question here a few minutes ago and so I've no further details of the boiler (make, size etc.) but if it helps I can get them very easily. The boiler is likely to have quite an output as it is running 9 radiators in zone 1 and a further 9 (IIRC) large ones in zone 2.
Any thoughts appreciated.
Hwyl!
M.