How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Brian Your Own Question
Brian, Plumber
Category: UK Plumbing
Satisfied Customers: 845
Experience:  16 yrs. experience as plumber, including full bathroom and kitchen installations.
Type Your UK Plumbing Question Here...
Brian is online now
A new question is answered every 9 seconds

Boiler keeps pressurising and switching off. Also noticed the

Customer Question

Boiler keeps pressurising and switching off. Also noticed the thermostats gauge is below zero and into the pressure gauge reading. Any ideas. Thanks.
Submitted: 2 years ago.
Category: UK Plumbing
Expert:  Brian replied 2 years ago.
Hi, my name is***** have been in the plumbing & heating trade for approximately 15 years. I will be helping you today. This sounds like either the filling loop is stuck open or the expansion vessel has lost pressure or ruptured.
try filling the boiler again via the filling loop to 1 bar. the boiler must be cold. then disconnect the filling loop. turn the boiler on and monitor the pressure if it goes high the expansion vessel needs pressurising or the bladder has ruptured inside.
Could you also let us know the make and model of the boiler