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Erratic hot water and central heating - BoilerMate 2 thermostat problem or main bolier problem?

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Erratic hot water and central heating - BoilerMate 2 thermostat problem or main bolier problem? Empty Erratic hot water and central heating - BoilerMate 2 thermostat problem or main bolier problem?

Post  EW Sat Dec 17, 2011 7:07 am

I woke up this morning with very little hot water or central heating - both luke warm. The water in my 1997 BoilerMate 2 cooled right down over night which I know its not supposed to do. This has happened twice in last 9 days. By about mid morning the water in the BoilerMate had heated up to normal & both central heating & hot water are now working fine even though I didnt do anything to fix it! Having visited Mike the Boilerman website (so helpful Mike - thanks) I think I might need to replace the thermostat on the BoilerMate. Before I order a new thermostat XB117 - cost approx £50. Does Mike or anyone else think that this is the likely cause of the problem? Can BoilerMate thermostats become temperamental? Its strange how the cool down has only happened a couple of times & not permanently. Also how easy is it to install it? The only other thing I can think of is that I may have a problem with the main boiler although as working fine most of time this seems unlikely to me? Any views? It is a 1997 Baxi Solo 2 PF. I do also have the 'dreaded buzzing noise' from the BoilerMate and have purchased a replacement Pump Drive PCB X104 (definitely buzzing!) & I may also have to replace the Pump Delay Timer PCB (not sure if this is buzzing). I havent fitted the Pump Drive yet as I wanted to wait until after Xmas in case I screw up & need to call a specialist out!. My understanding is that although the buzzing is annoying, it cannot be the cause of the main problem I have ie total cooldown of BoilerMate. Am I correct? All help much appreciated. Thanks.

EW

Posts : 5
Join date : 2011-12-17

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Post  mike Mon Dec 19, 2011 8:13 am

Did I deal with you this morning by telephone?
Mike
MGC/H2O
Norfolk

mike

Posts : 1747
Join date : 2009-10-08
Age : 68
Location : Norwich

http://www.mgch20.co.uk

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Post  EW Tue Dec 20, 2011 12:37 pm

Hi Mike,

Thanks for response - no it wasnt me that you spoke to (I live in Bucks). Can you answer a few questions? Things have developed since my original posting on Saturday in as much as the boiler packed up completely late Saturday night & hasnt worked since. I had a local engineer come round yesterday and his diagnosis is that the pcb in the main boiler needs replacing & he is planning to do tomorrow. It looks like that was the problem all along, although I find it hard to get my non techie head around the fact that the pcb failed to do its job and then started up again. The total loss of heat happened twice (overnight so I wasnt able to check if main boiler had packed up) in the 10 days before total shutdown. I thought electrical components either worked or they didnt? Anyway I now think it unlikely to be anything wrong with BoilerMate thermostat (we shall know for sure once main boiler is up & running again). Am I correct in assuming that if anything is not functioning properley on the BoilerMate & associated stuff ie Pump Drive PCB / Pump Delay Timer PCB / 2 pumps at base of unit etc that they cannot be the cause of the main boiler not operating? Why do I have 2 pumps at the base of BoilerMate? Are they both for the central heating? Yesterday morning I replaced the Pump Drive PCB & once the boiler is back on I will know if that has stopped the buzzing.

Any help much appreciated.
Regards
Paul

EW

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Join date : 2011-12-17

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Post  mike Wed Dec 21, 2011 2:08 am

Have you the manual on your unit?
If not down load one for Free at Gledhill website.
Home work test;
That will tell you what the 2 pumps are and the pcb's.
Post your answer on here as many read these.
Right PCB or electrical components.
Oh yes they will play up, intermittent faults are the worst.
As they never show when an engineer calls. Very frustrating.
Some will be ok and working until they get hot.
Or vice a versa.
Many reason really, bet you find more if you Google it!
I look forward to your answers ref the pumps.
No reprieve even if it is Christmas!
Mike
MGC/H2O
Norfolk

mike

Posts : 1747
Join date : 2009-10-08
Age : 68
Location : Norwich

http://www.mgch20.co.uk

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Post  EW Wed Dec 21, 2011 12:17 pm

Hi Mike,

Thanks for homework! I looked in manual - one pump is for between boiler and boilermate & other is for radiator circuit. The 2 pcb on boilermate: 1) pump drive pcb to run the central heating pump for a few seconds every forty hours to prevent it seizing up over somer months when not in use. 2) pump delay timer to keep pump running for a short while after the boiler has shut down to extract residual heat in the main boiler heat exchanger. I look forward to my homework marks! The engineer has replaced the pcb on my Baxi boiler and everything is up and running fine again. The engineer charged £70 (very reasonable I thought) for replacing the boiler pcb and the pcb cost £161 from Plumb Center (glad I didnt purchase cheaper online as first one didnt work & engineer took back & Plumb Centre replaced it). I purchased the pump drive pcb from ebay, cost £39.35 including postage & installed myself and I am glad to say the buzzing has stopped. Me, the wife & daughter can now relax knowing we have central heating & hot water for Xmas!

Can you answer a couple of other questions relating to the pumps please? The sharing of knowledge is much appreciated.

If one or both of the pumps were to fail in the future what would happen? The pumps are very quiet and I wouldnt notice if they were running or not. The ch & hw is working fine & if I touch the pumps I can feel them them vibrating slightly and are very hot so I assume they are working but thats not something you would do very often. Am I correct in assuming that if the pump on circuit between BoilerMate & boiler failed the boiler would overheat and cut out? Presumably I would notice a lack of heat coming from radiators if the pump on radiator circuit failed? Please confirm if I am correct & please dont set me any more homework as my non techie brain cant cope with any more!

Regards
Paul

EW

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Join date : 2011-12-17

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Post  mike Wed Dec 21, 2011 3:33 pm

Well Paul 10/10
Full marks.
And I hope others will follow.
If the boiler pump failed, you are right the boiler would fire and stop or even go to reset etc.
Heating pump again No heating or limited heating.
It does pay to have a look in the cupboard now and again.
And listen too. Then you will know what is normal etc.
Glad you are all sorted for Christmas.
Merry Christmas & A Happy New year to you.
Mike
MGC/H2O
Norfolk.

mike

Posts : 1747
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Age : 68
Location : Norwich

http://www.mgch20.co.uk

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Post  EW Thu Dec 22, 2011 3:26 am

Thanks Mike for marking my homework so promptly (unlike some of the teachers at my daughters previous primary school - but we wont go into that!)
Thanks for the answers & advice.
Merry Christmas & A Happy New year to you as well.
Paul

EW

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