Combi boiler overflow running constantly

sc0ttie

I have a combi boiler in my flat, i put heating on tonight as i felt a bit cold, havent used it for ages. When the heat came on the boiler made a large knock sound and i got worried and turned my heating off. The pressure gauge is showing the needle at between 3 and 4. The overflow pipe which runs outside the building is like a running tap and has been for at least an hour now.

My landlord has not given me any numbers to call in emergency and I do not have money to pay an emergency plumber, I am in debt enough as it is. I dont know where the stopcock is in the flat, i was never shown it by the agent. The agents number goes to voicemail.

what can I do? There is a lot of water falling into the front garden and i am also worried if i have to leave this my water bill is going to be huge. worried

Crinkmeister

If the filling loop has been left open, then you will overpressurise the system. Has that been done? Is water still running out?

rob7475

What is the pressure needle at when the heating isn't on? It should be between 1 and 1.5? If it's higher, you need to release some water from the system by opening a drain !!!!.

If the pressure is OK but increases when you turn the heating on, it could be the expansion vessel. Sometimes this can be fixed by pumping air into it with a pump, other times, you need to replace the valve.

It's your landloards responsibility to sort it - get onto the letting agent or go and see them if they don't answer the phone.

macman

Close the filling loop! Usually under the boiler. Since the PRV has done it's job and lifted, it'll probably now need replacing, as they rarely reseat properly. Then open a rad valve until the pressure drops back to 1 bar. Don't use the boiler until that is done.
I suggest you find out where the stopc*ck is ASAP, because next time you may not have a leak where it discharges merely into the garden.