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Author Topic: Any combi boiler experts out there?  (Read 2168 times)

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Nickbat

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Any combi boiler experts out there?
« on: 15 November 2009, 15:34:23 »
I have a problem getting my boiler to kick in when the hot taps are turned on. To get the hot to flow in the kitchen, I have first to turn on the bathroom hot tap, then turn it off once the boiler fires up. However, sometimes, even after turning on the bathroom tap it can take a good minute or two before the boiler fires.

I changed the kitchen taps a couple of weeks ago and the problem, which I think existed before, has become much worse since.

On the boiler (a Vokera Maxin 24), there is a hot water temperature control (just a knob, with a thinner to thicker line denoting min to max) and that is truned to its maximum.

There, that's all the info I can think of.

Is this a situation which requires a service engineer?

Hope not, they cost a fortune!  :( :'(
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MickAP

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Re: Any combi boiler experts out there?
« Reply #1 on: 15 November 2009, 15:56:24 »
Does the heating side of things work ok, is it presurrised ok?
Went out to my sons house the other night and his had lost all pressure in the system preventing it from firing up, got it back up to pressure and let loads of air out from the system (heating) and all was ok again, it fired up.

Mick
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Nickbat

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Re: Any combi boiler experts out there?
« Reply #2 on: 15 November 2009, 16:24:28 »
Quote
Does the heating side of things work ok, is it presurrised ok?
Went out to my sons house the other night and his had lost all pressure in the system preventing it from firing up, got it back up to pressure and let loads of air out from the system (heating) and all was ok again, it fired up.

Mick

Yep, all pressurised and the heating works.
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cem_devecioglu

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Re: Any combi boiler experts out there?
« Reply #3 on: 15 November 2009, 16:48:06 »
problem seems similiar to mine I had before..

there is a valve/gasket similiar that must be changed..

cheap not something expensive in mine.. I think it will be same for yours..by the way I call someone and watch when he's changing ;D :y
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Debs.

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Re: Any combi boiler experts out there?
« Reply #4 on: 15 November 2009, 16:53:11 »
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)
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cem_devecioglu

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Re: Any combi boiler experts out there?
« Reply #5 on: 15 November 2009, 16:55:31 »
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)

long live Debs :y
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Marks DTM Calib

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Re: Any combi boiler experts out there?
« Reply #6 on: 15 November 2009, 17:28:35 »
Flow sensor......I would say
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PhilRich

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Re: Any combi boiler experts out there?
« Reply #7 on: 15 November 2009, 18:16:46 »
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y
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If it ain't broke keep fixing it 'til it is!

Nickbat

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Re: Any combi boiler experts out there?
« Reply #8 on: 15 November 2009, 22:12:07 »
Quote
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y

Thanks girls and guys!  ;)

I guess that's an engineer job, then. :(

Especially as I've heard it's illegal to fiddle with them if you're not Corgi registered.
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ENFIELD_MV6

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Re: Any combi boiler experts out there?
« Reply #9 on: 15 November 2009, 23:23:35 »
Quote
Quote
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y

Thanks girls and guys!  ;)

I guess that's an engineer job, then. :(

Especially as I've heard it's illegal to fiddle with them if you're not Corgi registered.

if the person who comes is CORGI registered avoid as it means that they have not took the gas safe exam which has superceeded corgi. Basically corgi no longer exists so if thats the only badge/crudentials they have ask them if they are gas safe registered  :y :y :y
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Nickbat

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Re: Any combi boiler experts out there?
« Reply #10 on: 15 November 2009, 23:25:45 »
Quote
Quote
Quote
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y

Thanks girls and guys!  ;)

I guess that's an engineer job, then. :(

Especially as I've heard it's illegal to fiddle with them if you're not Corgi registered.

if the person who comes is CORGI registered avoid as it means that they have not took the gas safe exam which has superceeded corgi. Basically corgi no longer exists so if thats the only badge/crudentials they have ask them if they are gas safe registered  :y :y :y

Thanks for the tip!  :y
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ENFIELD_MV6

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Re: Any combi boiler experts out there?
« Reply #11 on: 15 November 2009, 23:29:40 »
Quote
Quote
Quote
Quote
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y

Thanks girls and guys!  ;)

I guess that's an engineer job, then. :(

Especially as I've heard it's illegal to fiddle with them if you're not Corgi registered.

if the person who comes is CORGI registered avoid as it means that they have not took the gas safe exam which has superceeded corgi. Basically corgi no longer exists so if thats the only badge/crudentials they have ask them if they are gas safe registered  :y :y :y

Thanks for the tip!  :y

No worries use to help a gas safe engineer do some plumbing work (fetching and carrying plus lifting the boiler onto its brackets lol) and learnt a fair bit as he only ever fitted combi boilers when replacing systems so did learn a fair bit along the way
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Marks DTM Calib

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Re: Any combi boiler experts out there?
« Reply #12 on: 16 November 2009, 08:30:11 »
Quote
Quote
Quote
My thoughts...
London hard water: heat exchanger choked or flow sensor/diaphragm is sticky or faulty. ;)


Spot on Debs, you clever girl! I'm a retired gas service engineer and those are the two most likely culprits :y

Thanks girls and guys!  ;)

I guess that's an engineer job, then. :(

Especially as I've heard it's illegal to fiddle with them if you're not Corgi registered.

Not that any of them are engineers, fitters or technicians is the correct reference.

Also, the laws are quite clear as they dont state that you need any specific certification if doing a job for no reward, you simply need to prove compitence (for which thier are methods).

To add to it, the chances are that the flow sensor is external to the main gas part (combustion chamber and burner section) and hence is very accessable with pretty much 0 risk on the gas front (and hence means the job technicaly falls outside that covered by the gas regs anyway).

Even better, the manual for the lump will probably tell you where it is and the part number.

I dont buy the heat exchanger bit as this would not slow the boiler firing unless the flow rate was stupidly restricted.

I get bits here:

http://www.onlineboilerspares.com/
« Last Edit: 16 November 2009, 08:50:36 by Mark »
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Marks DTM Calib

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Re: Any combi boiler experts out there?
« Reply #13 on: 16 November 2009, 08:32:57 »
In fact, here is the diagram in question

http://www.onlineboilerspares.com/product1897.html
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Marks DTM Calib

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Re: Any combi boiler experts out there?
« Reply #14 on: 16 November 2009, 08:41:08 »
And here is the manual

http://vokera.excaliburstudio.co.uk/wp-content/uploads/2009/04/maxin_24e_28e_installation_and_servicing_-instructions.pdf

Note, the manaul confirms that you do not have to access the burner chamber.
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