Glow worm boiler swit flow combi boiler Pressure drops every time it has fired and when finished after ashort spell will drop right down to be repressurized by me no sign of leaks or pressure leaking.
Swift combi boiler builds up pressure after a short while either firing or standing still . I have to release safety vave to ease pressure. Do I have to replace water pressure switch or the elecrical compoments what way Iam able to find out .Is it somthing else not related to what think it is.
thanks
frank
July 2008
It sounds to me like a faulty expansion vessel on the boiler, they can be recharged with a pump ( normally like a car valve) or it maybe punctured inside the vessel which means you will need a replacement.They are quite awkward to fix, id get a pro in who knows swiftflos, they can be fiddly.
PK1
April 2008
hi, i had a similar problem, there were a few problems one was there was dirt in sum of the pipes and also if you have an open and shut valve keep it shut after you have put the pressure back up.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.