A friend called me today with a heating connundrum.
He has gas fired central heating and when he turns on the gas boiler it's supposed to heat up the hot water cylinder and the radiators.
The trouble is, it heats up the cylinder and when the cylinder gets hot it shuts down the boiler. At this stage the rads are barely luke-warm.
If he tries to over-ride the shut down to heat the rads, the cylinder will boil.
The only way he can get his rads to heat up properly is to drain the hot water from the cylinder down the drain.
Has anyone come across this sort of problem before? And if you have, how did you fiix it so that the cylinder and the rads heat up properly?