Over-filled Vaillant combi boiler Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[mblago]

I've accidently over-filled my vaillant EcoTec28 Pro combi boiler via my filling loop, can one of you experts advise me how I relieve the pressure please?

[bazza]

hi mblago you cud reduce the pressure by the prv valve if you feel confident enough or you can simply open a bleed vent on one of the radiators and catch the water into a container and close the bleed valve wen the pressure is at the correct reading which is normally between 1-1.5 bar hope this helps bazza

[htg engineer]

easiest way is to manually open the pressure relief valve - but you take the risk that if it doesn't re-seat correctly you may need to strip out and clean or replace.

Vent radiators ? if theres any air in this will be replaced with water.

Drain from a drain off either near the boiler or on the radiator valves.

[mblago]

Thanks for your reply guys, but can you tell me how I would recognise the PRV please?