Boiler not turning on because your condensate pipe could be frozen.
Condensation is a normal by-product of a boiler and is made when the gas is burned to create heat. This condensation is discharged automatically into a drain either inside or outside the house. Unprotected or incorrectly installed condensate pipes can freeze in extreme conditions, preventing the boiler from working.
It is best to install condensate pipes inside the house to avoid freezing. Sometimes this is not possible, in which case you can position the pipe so that it discharges to an outside drain. In this situation, the pipe must be installed in line with manufacturer’s instructions, be of an adequate size and be insulated to prevent freezing.
The Fan in Your Boiler Needs Replacing
Boilers produce waste gases which must be safely released. Your boiler contains the fan that pushes the waste gases through a pipe, known as a flue, to the outside of your home, where the gases are safely released into the air. The flue is very similar to the exhaust pipe on a car.
If for any reason your fan stops working, your boiler will not work, so the fan is an important safety feature. Replacing a fan is straightforward, but your installer will need to investigate why it failed to work in the first place.
You Have Sludge in Your System
Sludge is the material that has settled to the bottom of a heating system, usually your radiators. It will make your heating system run less efficiently and can lead to boiler parts failing. Sludge is usually made by having air in the system. This can make the inside of the radiators rusty.
Sludge builds up in the bottom of the radiators and sometimes on parts within the boiler, such as the pump. You can tell there is sludge in your system. There will usually be cold spots at the bottom of your radiators. For the system to run as efficiently as possible. A competent installer needs to remove the sludge, using chemical cleaners or a power flush, or both.
You Have Air in Your System
Heating systems should contain only water. Your system has air in it. This needs to be taken out as it’s causing a problem or threatens to. For your system to be running as efficiently as possible, only water should be present in the pipework and radiators.
If you have air in your system it will not work efficiently. You will often notice this by bubbling noises in the radiator, or the top of the radiators will be cool. Your installer should investigate the cause of air building up in the system. They can often easily solve the problem by bleeding the radiators.