Why are the radiators in my bedroom and bathroom not hot?

The coal-fired water-type heating time is about 03:00--09:00 12:00 in the morning

00, the rest of the time is not burned, as for the heating at two or three o'clock in the evening, it is definitely not hot, and it is just mild at 4 o'clock! I have been using a circulating pump to pull that little residual temperature in the boiler. Hula is because the top floor gas is not filmed, or the static pressure in the boiler room is not enough, and when the pump is turned on, the water will go up when the pressure is high, but it is not full of water, so this kind of problem will also occur, you go to the boiler room to find a maintenance for you, generally they love to fool you, pay special attention.

There is no household is a large horizontal pipe for water supply on the top floor, and each branch pipe below will be connected up and down the heating of each house, so the heating is not hot and you have to go to the top floor to exhaust, called maintenance, or it may be that the heating is blocked, call the maintenance worker to go to the top floor to remove the top floor pipe and replace the pipe, generally replace the titanium pipe, soft - good work!

There is air in the radiator, let it air quickly, it is best to leave it for a while, and then close the drain valve after the water comes out.