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 Plumberpro Your Own Question

Plumberpro
Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience:  Heating and plumbing answers. 20 years experience
77408428
Type Your Plumbing Question Here...
Plumberpro is online now

What should the correct pressure be in the expansion vessel

Resolved Question:

What should the correct pressure be in the expansion vessel of a Biasi Prisma 24SE combi boiler please?
If it is too low, will it prevent the fan from starting?
My problem is that the fan is not starting.
Submitted: 2 years ago.
Category: Plumbing
Expert:  Plumberpro replied 2 years ago.
Plumberpro :

Hi , 1.5 bar

Plumberpro :

It won't prevent the boiler from firing , only birth before a sure is below 1 bar

Customer:

What does "birth before a sure" mean please?

Customer:

Hello, is anybody out there?

Customer:

Don't you think it's worth checking on the answer you gave? Perhaps your customer might have a query? A query such as asking to type in English? Or maybe how to claim a refund?

Plumberpro :

Sorry , my tablet does this predictive text thing .meant make sure the pressure gauge reads above 1 bar

Plumberpro :

The fane will not start unless the pressure is right

Plumberpro :

The fan will not start unless the pressure us right

Plumberpro :

The fan will not start unless the pressure is right

Plumberpro :

Just doing my lines, practice makes perfect.

Customer:

Well the pressure is right. It's 1.5 bar, so why won't the fan start? I believe the sequence is fan, pump, ignition. Is that right? If the fan doesn't start, then nothing else will start, so what's preventing the fan from starting? If I put 230V on the fan from the mains, then it works, so it's not the fan.

Plumberpro :

Just double checking the manual. 5 mins , thanks

Plumberpro :

It is pump running , flow switch operates, fan runs , air pressure switch operates, boiler gas valve opens on low , sparking begins, flame rectification probe( sensor) detects flame , gas valve opens fully . temp sensors regulate

Plumberpro :

So you may have a problem with your pump or flow switch

Customer:

So the order is 1st Pump then 2nd Flow switch then 3rd Fan then 4th Air pressure switch then 5th Gas valve then 6th Spark.

Customer:

I'll have to check my pump tomorrow. Thanks

Plumberpro :

Your welcome

Plumberpro :

Hi , could you please rate your answer , thanks

Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience: Heating and plumbing answers. 20 years experience
Plumberpro and other Plumbing Specialists are ready to help you

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • theplumber717

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
< Previous | Next >
  • http://ww2.justanswer.co.uk/uploads/TH/theplumber717/2011-11-24_34039_DSCF7012.64x64.JPG theplumber717's Avatar

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
  • http://ww2.justanswer.co.uk/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    202
    Heating and plumbing answers. 20 years experience
  • http://ww2.justanswer.co.uk/uploads/BI/billyjr1961/2013-9-27_11122_ATT1351123267229photo.64x64.JPG Billy's Avatar

    Billy

    Technician

    Satisfied Customers:

    206
    Mechanical Contractor
  • /img/opt/shirt.png Brian's Avatar

    Brian

    Plumber

    Satisfied Customers:

    47
    16 yrs. experience as plumber, including full bathroom and kitchen installations.
  • http://ww2.justanswer.co.uk/uploads/MA/MarkAYng/2011-1-15_16358_Markcameo2008b.64x64.jpg MarkAYng's Avatar

    MarkAYng

    Handyman

    Satisfied Customers:

    0
    Knowledgeable in home, electrical and small appliance repair.
  • http://ww2.justanswer.co.uk/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Home Improvement Enthusiast

    Satisfied Customers:

    332
    Electrical contractor's license