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FF260P Boiler cutting out - should I try replacing the pump?

Discussion in 'Plumbing and Central Heating' started by thesandman, 20 Dec 2014.

  1. thesandman

    thesandman

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    Location:
    Sussex
    Country:
    United Kingdom
    Everything seems to work OK at first.

    Controls call for heat
    Fan starts.
    Usual clicks an noises.
    Spark starts.
    Pilot lights.
    Main burners come on - Whoomph

    Fires for between 2 - 10 minutes depending on how cold it is to start.
    Tick noise - then main burners, pilot, everything goes out.
    System still calling for heat.
    Ignition still firing (spark still showing - I can hear regular ticks)
    10-15 minutes laters after boiler has cooled down - system will reignite (pilot, main burners etc)
    Then shuts down after 2-5 minutes again and goes through this cycle again.

    So that's the problem - now some other stuff that might help diagnosis:
    Radiators come on fairly quickly.
    All radiators get heat at same time. No cool radiators (all rad valves open)
    If boiler runs for 10 minutes they are all nice and hot (although cooler at bottom - but this could be they just don't have time to heat up properly?)

    All rads bled and air free.

    Loft Expansion tank seems to be working OK.

    I drained some water from the system (at the boiler ) and loft tank filled up again fine.

    Rad circuit is 15mm and also microbore 8mm

    Boiler sounds fine when getting hot - no kettling noises.

    Overheat button not popping out.
    Boiler never gets as hot to the touch as is used to when running normally (just gets warm).

    Happens on both HW and Heating.

    With heating the return pipe to the boiler takes a while to heat up - but at a bout the time it cuts out it is starting to get hot. Eventually it will reach about the same temp. as the flow pipe (of course the flow has cooled down by now as the boiler has cut out).
    With hot water on (immersion on also) flow pipe gets v. hot quickly - return pipe gets v. hot also - maybe 10% difference between the two. Still runs for a few minutes then cuts out.


    Water pump appears OK.
    Removed Grundfos screw - and can see pump spinning - changes speed from settings 1,2,3 and goes nice and fast on 3.
    Took it apart and gave it a clean - no nasty rattling or scraping sounds.

    Recently had new fan fitted.

    Some things have read suggest that circulation problems can cause the boiler to overheat and cut out - and issues could be:
    Air lock (have an automatic air lock removal thing that I could hear cutting in fine when I took the pump apart for a clean)
    Faulty pump
    Bockage in pipes (usually cold feed - but when I ran water through from the loft tank it all seemed pretty clear) - not a huge amount of gunk in there.

    So - before I buy a new pump / drain the system / pay for a powerflush etc etc - what do you fine gentlemen and ladies think?

    Boiler or circulation system?

    Thanks for your advice.
     
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  3. Terrywookfit

    Terrywookfit

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    Phone your R G I.
     
  4. thesandman

    thesandman

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    Thanks for the advice.
    Glad to know it's the boiler and not the pipes etc - saved me loads of time and effort!

    I'll call someone Monday.

    Cheers
     
  5. thesandman

    thesandman

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    Well - XMAS is over so finally got the RGI in.

    He says it might be the thermostat / thermistor

    Or the PCB

    Or the Pressure switch

    Or the gas valve

    Or something else...

    We are going to start with changing the thermistor and go through them in this order unless anyone can advise any different?

    Thanks
     
  6. 45yearsagasman

    45yearsagasman

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    Get someone else, you've employed a parts changer, and no, I can't say whats wrong from behind a keyboard.
     
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  8. Dan Robinson

    Dan Robinson

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    Would have been quicker if he said "it is the boiler".


    Get someone else. Guy sounds like a pillock.
     
  9. garethdavies

    garethdavies

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  10. thesandman

    thesandman

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    He'd already ordered the 'stat and I was in for the £65 call out fee anyway - so I figured what the hell - he can fit it.

    Oh dear.

    Call from the missus to ask where the stop cock is - as there is water ****ing out all over the place - and he's shouting **** ****!!

    Turns out the 'stat was stuck in the recess - and when he's pulled it out he's taken some of the boiler with it - leading to major flood and panic.

    So now he's quoting £1300 for a new boiler (or he might be able to jerry rig some kind of replacement part?)

    What do you think - should I have to pay all the costs for a new boiler?

    And yes - he is registered - and works for a reputable local firm who have good reviews on check a trade etc.
     
  11. Terrywookfit

    Terrywookfit

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    YOU SHOULD HAVE TAKEN THIS ADVICE!!

    Pardon me whilst I snigger!! :LOL:
     
  12. DIYnot Local

    DIYnot Local

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