Is a boiler water leak dangerous?

You should never see water coming from your boiler. While it’s not necessarily dangerous, you should switch off your boiler to prevent your electrics short-circuiting and to stop water damaging your home or belongings. Don’t try to fix a boiler leak yourself. Always let a Gas Safe engineer take a look.

Why does my boiler air pressure switch not work?

The boiler fans starts but the boiler does not ignite. When the fan starts during the Sequence of Boiler Operation, the boiler air pressure switch must signal the printed circuit board and then ignite. But (for example) if there is a blocked flue, the air pressure will not work correctly and remain closed – creating a fault.

What happens when the fan on a boiler stops working?

When it recognises this issue, it effectively tells the PCB that the fan isn’t working. And, just as a boiler won’t fire up without the fan working, if at any point the PCB receives the signal that the fan has stopped working during operation, it’s going to cut gas supply to the gas valve.

What happens to the diaphragm when a boiler fan starts?

When the fan has stopped, a force (usually a spring or gravity) returns the diaphragm to its rest/no air flow position. The boiler fans starts but the boiler does not ignite. When the fan starts during the Sequence of Boiler Operation, the boiler air pressure switch must signal the printed circuit board and then ignite.

How do you turn on a hot water boiler?

Then get someone to switch on demand for the hot water and tell us what the lever does. There should be a very obvious ‘whirr’ from the unit follwed by a light ‘click’ as the little microswitch inside is activated. The boiler should then turn on.

Why does my boiler not fire up the air pressure switch?

In this case the fault is with the boiler fan, an is not an air pressure switch issue. The fan will create a draught which allows the harmful gases to be released from the boiler via the flue. In order for the boiler to fire up the air pressure switch needs to have recognised that the fan is actually running.

Why does my boiler fan not close down?

The boiler fan must expel flue gases. If the fan is running at a slow speed, it won’t react to the back-pressure created in the flue system. The boiler air pressure switch recognises the pressure difference, and closes down the boiler. In this case the fault is with the boiler fan, an is not an air pressure switch issue.

When do you need to replace a boiler fan?

But, if the pump/fan is in poor condition, a replacement component would be a much wiser option. We’ve already mentioned that the fan on your boiler needs to push dangerous gases out of the flue. For that to happen, it needs to be operating at the correct speed.