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 Andrew Smith Your Own Question
Andrew Smith
Andrew Smith, HVAC Technician
Category: HVAC
Satisfied Customers: 3757
Experience:  Heating and Controls engineer
Type Your HVAC Question Here...
Andrew Smith is online now

My Baxi Bermuda with a back boiler has recently developed

This answer was rated:

My Baxi Bermuda with a back boiler has recently developed a fault.After it has been off for a few hours and has cooled down it will fire up immediately when switched on but after one and a half to two minutes it seems to struggle to re-fire and there is a roaring sound like the oldfashioned blowlamp.
I then switch off for a couple of seconds and switch on again and it will refire immediately, but after another two minutes the same thing happens when I have to repeat the same procedure after which it will work perfectly for the rest of the day.
Two days ago this appliance was serviced by a gas engineer but he was unable to diagnose the fault.
Can you help please.


The roaring is a blow back in the burner


This means there is a small gas leak around the burner and it gets pushed into the burner with the gas/air mixture and lights at the injector


You should get the burner stripped out and resealed to prevent this happening again

Customer: Thank you for your reply.Can you explain why this only happens when the appliance is first switched on, but works ok when it has warmed up
Andrew Smith and other HVAC Specialists are ready to help you