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boilermate II - outside overflow pipe leaking

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Post  DP5 Sun Aug 21, 2011 12:14 pm

Hi Mike, I have a boilermate II in the airing cupboard and an Ideal Classic boiler in the kitchen. This system is approx 16 year old now and usually works fine. It has been treated well with the recommended chemicals every 12 months or so (the odd flush, inhibitors, and other treatments, etc) over the years. It currently seems to be running well, lots of hot water when required, etc (rads also heat up quickly) and it is silent - no knocks, running water sounds or weird sounds. However, last week for no apparent reason the outside overflow pipe has started constantly dripping cold water, usually 1 drip every 5 seconds but sometimes upto 1 drip per second so there is quite alot of water on my patio at times! I have checked the overflow pipe and expansion pipe that are inside the top drum of the boliermate II by removing the plastic lid and the water is not coming up upto this level (it is about 10mm below) and the main supply ballcock does not seem to be leaking so i am pretty certain that the leaking is not coming from these pipes. Is there is any other way for the outside overflow pipe to expell water? The only change made to the whole system in the past 2 weeks is that my wife has turned down the ideal Classic boiler dial from 4 to 2 which controls water temp. The water has been leaking for about 10 days or so. Any ideas to a simple solution for this, if not and it is more complicated (dripping water can never be a good thing!) i will call to arrange a time for you to come to look at it?? Im pretty local to Reading. Thanks Dan

DP5

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Post  mike Mon Aug 22, 2011 2:23 am

Ball valve most likely.
Unless the unit is pumping over.
Due to sludge etc.
But as the unit is up to date with it's treatment.
Ball valve.
Another possibility which it is NOT.
Could be a leak on the internal coils ( mains water)
BUT you would have a constant problem.
Easy thing to do is;
Take some water out of the top tank.
THEN you will see the ball valve dripping.
Oh and see what colour the water is when you take some out.
Mike
MGC/H2O
Norfolk

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Post  DP5 Mon Aug 22, 2011 5:33 am

Hi Mike, thanks for the reply.

However, how would a dripping ball valve make the outside overflow pipe leak? I have already mentioned that the waterline in the top tank of the boilermate II is about 10mm below the overflow pipe and expansion pipe level so the water is not reaching up to the level required to overflow out. I dont think a leaking ball valve is the reason unless i have mis-understood you.

As i have said, the dripping from the outside overflow is constant so the other suggestion of 'leaking internal coils' may be the cause....sounds like a 'new boiler' to me but any more info on this?

FYI - the water inside the top tank is warm in temperature and a cloudy/white coloured with some white bits that look like small pieces of wet tissue or mould floating in it (its not wet tissue though!) so it is not fresh water.

any info would be helpful to see whether it is a repair job or a replacement job.... maybe time to get a mega-flow!

thanks Dan

DP5

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Post  Mike the Boilerman Mon Aug 22, 2011 3:29 pm

DP5,

I think you left me a voicemail today with the same question.... My apologies I've been in Shropshire all day where they don't seem to have mobile phone signals!

As Mike from Norfolk says, this is going to be either a dripping float valve OR the internal domestic heat exchanger coil is leaking. As the top tank water is warm, my money is on the latter.

Prove (or disprove!) this by disconnecting the water supply from the header tank - there may be an isolating valve you can turn OFF. If the problem persists with the float valve isolated it has to be a leaking coil. The only fix for this is a new Boilermate or as you say, a MEGAflo. Bear in mind the MEGAflo needs a tightly specified 'safety discharge pipe' to be installed and often this is impractical, which is why the Boilermate was installed in the first place.

HTH,
Mike

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Mike Bryant AKA Mike the Boilerman, Gledhill repair specialist, webmaster of www.gledhill-repairs.co.uk & www.miketheboilerman.com. For information about my Gledhill repair service or to make a booking call me on 07866 766364. (Please don't phone me for advice if you are fixing a Gledhill yourself, ask on here instead - I run this forum partly to cut down on the phone calls!)

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Post  nelgibson00 Fri Sep 14, 2012 6:13 am

May be your holding tank in the attic is full due to which the float doesn't stop water properly coming into holding tank so the drips follow through the overflow pipe I have this problem too.

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