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Thread: Baxi Boiler problem

  1. #1
    Regular Member Ste's Avatar
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    Default Baxi Boiler problem

    Our boiler has started playing up. It is a Baxi, and I believe it is a 'Solo' model, power rating unknown.

    The other week I cured the heating issues by flushing and balancing the rads.
    Now the boiler has started to not work.

    On the front there is a removable panel, behind this panel is the temp control knob and some lights.

    In order, from left to right.

    overheat
    boiler on
    fan on
    pilot on
    burner on


    It doesn't get past the fan on light coming on.

    Normally the lights come on in order

    Boiler on
    fan on
    pilot on
    burner on

    Also, there doesn't seem to be any noise of the fan working from the discharge point (there certainly used to be)

    Any ideas? Is it the fan or controller?

    I am thinking more towards fan malfunction, as the fan on light illuminates, but the fan doesn't spin up, couple with it making a bit of a noise yesterday. A bit of a noise means a faint squeaking noise, as if the 'blades' were slightly catching the cowling.

    Tonight I am going to try to determine whether there is any power getting to the fan (hereby proving if the fan or PCB is at fault).

    Any advice to get to the fan assembly, or is it self explanatory once the main covers are removed?
    As it's not gas related I have no problem in attempting to find the fault.


    TIA

  2. #2
    Regular Member 67688c's Avatar
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    Default

    The outward extractor fan normally has to be running before the boiler will fire up, for obvious reasons. There will be a sensor in the airflow to detect whether its running or not. It definately wont work unless that fan is running.

    So I think your diagnosis assumptions are correct. Big question is... why is it not running? Sounds like you have the right idea's working your way back from the fan. May just be all bunged up with dirt etc.

    Mines a Worcester boiler, but my youngest son had a problem with his baxi last year and I recall him saying that there was a lot of info on the net including diagrams and parts etc. perhaps a search for the model of the boiler.

    Hope you sort matey, let us know what it turns out to be.
    Last edited by 67688c; 29th October 2008 at 15:37.

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    Regular Member videodoctor's Avatar
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    Default

    Have you checked that the pressure gauge is above 1 bar to 1.5 bar?

    If its low then the boiler won't fire.

    As you bleed the rads then the pressure drops and you have to keep topping it up.

  4. #4
    Regular Member Ste's Avatar
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    Default

    Yep, that's something I'm doing too.

    I agree with the fact that until and unless the fan is working, the pilot will not light and hence burner will not fire. There has to be a sensor to detect fan operation, a pressure sensor. But without fan turning there will not be any air movement and hence not be detectable. So the boiler is functioning as designed - ie not working as fan inop.

    No pressure sensor for water, it's a normal boiler with storage tank, not a combi.

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    Regular Member Ste's Avatar
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    Default

    It's a Baxi Solo 3 50 PFL model.

    GC number 41 075 22

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    Regular Member Ste's Avatar
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    Regular Member Ste's Avatar
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    Default

    For completeness,

    Dismantled the thing last night.

    Found the fan to be a little stiff when turned by hand. The motor was kicking in but couldn't turn it.

    Me being me, and bidding to save money under the current financial climate, I thought I'd dismantle the fan assembly to determine why it was so stiff. The reason became very apparent when i removed the spindle bearing races. One bearing was almost stuck solid.
    I couple of drop of oil later and a bit of persuasion freed it up lovely.

    All back together and working fine.

    Fan looks like this one.



    I thought £165 for a new fan assembly was a bit steep, and I dare bet you can't buy the bearings separately.

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    Regular Member macdad's Avatar
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    Default

    Quote Originally Posted by Ste View Post
    For completeness,

    Dismantled the thing last night.

    Found the fan to be a little stiff when turned by hand. The motor was kicking in but couldn't turn it.

    Me being me, and bidding to save money under the current financial climate, I thought I'd dismantle the fan assembly to determine why it was so stiff. The reason became very apparent when i removed the spindle bearing races. One bearing was almost stuck solid.
    I couple of drop of oil later and a bit of persuasion freed it up lovely.

    All back together and working fine.

    Fan looks like this one.



    I thought £165 for a new fan assembly was a bit steep, and I dare bet you can't buy the bearings separately.
    Alls well that ends well then ste..don't you just luv it when that happens,and a fair packet saved aswell ..so fair play to you.

  9. #9
    Full Member merikiito's Avatar
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    Stick some grease in instead of oil as it will last longer. Oil will run off and you will be back at stage 1 again, not working!
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

  10. #10
    Regular Member Ste's Avatar
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    Default

    Unfortunately, you have to make do with what you have to hand. The only thing I had was oil, so that is what got used. I didn't want to have the heating off another day, especially as the kids are not at school this week.

    If it goes again I will probably use something more permenant, but at 10:30pm you really don't have too many options.

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