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Old 21-09-2010, 09:20 AM   #1
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DIY Boiler Change...?

hi

typical...as soon as the weather starts to go a bit on the cold side my boiler (central heating) decides to go on strike..

i knew it was going to play up...has been making odd noises recently and i already had a couple of quotes from plumbers to replace it (nobody seemed interested in repair)

first guy quoted me 2600 to replace it...600 for the boiler and the other 2k for parts and labour, i challenged the guy straight away on the labour charge and he told me he thought his work was worth 1800 per day....

now no disrespect to any plumbers on here but brain surgeons dont earn that sort of money FFS, i politely told him to get lost...

second guy quoted me closer to 3K and said the first quote was so good he couldnt beat it...

so...

me being me i opened up the boiler to have a look myself, i presumed there was a fan inside the boiler that had been making funny noises recently and after opening it i found one, i took it apart, cleaned it and put it back in, boiler works ok now but the fan is on borrowed time...

whilst i had it apart i looked at the connections that would need to be hooked up if i changed the boiler myself, two water connections, one gas connection, one live wire...not exactly brain surgery?

so i have changed gas cookers before, i can solder pretty dam well so what is stopping me changing the boiler myself?

if you ask around peple seem horrified that i would consider taking a job like this on myself but to me it looks quite straightforward

am i missing something?
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Old 21-09-2010, 09:36 AM   #2
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im sure its against the law to change something that uses gas if you aint got the qualifications.

2.5-3k just for the boiler takes the piss. mum and dad got new boiler, new rads, new flew pipe and a remote control for the heating and they got charged 2.3k but managed to get it free due to mum being termanily ill and dad had to look after her so could not work.
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Old 21-09-2010, 09:41 AM   #3
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As above. It's illegal to mess about with gas without being qualified and you Should be able to get the whole house redone for around 2.5 - 3k.
But I've just noticed you live near London and prices seem to get silly down there
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Old 21-09-2010, 09:49 AM   #4
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I used to be Corgi registered through work up until 3 years ago and it is wasn't illegal then to work on your own installation, it only become illegal when you carry out work for other people or on a property you rent out. From the sounds of it the problem is only with the exhaust fan which can be replaced depending on the age of the boiler.
However changing the boiler does need some specialist equipment to set up the gas pressures while commisioning and it might be worth getting a professional to do this and check over your work.
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Old 21-09-2010, 01:37 PM   #5
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Quote:
Originally Posted by Dick_GTT View Post
I used to be Corgi registered through work up until 3 years ago and it is wasn't illegal then to work on your own installation, it only become illegal when you carry out work for other people or on a property you rent out. From the sounds of it the problem is only with the exhaust fan which can be replaced depending on the age of the boiler.
However changing the boiler does need some specialist equipment to set up the gas pressures while commisioning and it might be worth getting a professional to do this and check over your work.
ah, an educated opinion!!

from what i was told by the guys down this way with regards to me fitting my cooker was that the cooker had to be fitted "compently"...a lot of people just use the rubber flexihose to hook it up but i used copper pipe with soldered joints and i was told that this was 100% legal (is this true dick?)

what equipment is needed for setting up the gas pressure?, is there not a regulator in the boiler for this?

regards, brian
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Old 21-09-2010, 01:40 PM   #6
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I installed our boiler but left the gas alone and got the engineer in just to do that. He signed it off so everyone was happy
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Old 21-09-2010, 01:47 PM   #7
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what is the name of the boiler and how old is it
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Old 21-09-2010, 01:53 PM   #8
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i dont now how much the parts are but up here there fairly cheap and as for a boiler you can pick up a boiler plus flue for under 900 quid depending on how many rads you have in your house
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Old 21-09-2010, 01:53 PM   #9
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its an apollo 40i

i believe this to be the fan assembly (well it looks the same..)
http://cgi.ebay.co.uk/MYSON-APOLLO-S...item2a094d3174

the thing is though the reason i was considering changing the boiler is due to a couple of other reasons...

about a year ago the heating would make a god awful noise when started, bang bang bang bang and then turn off...

i scratched my head on that one and thought the pump had died so i changed the pump but it didnt fix the problem

so i took the wire to the pump and i stuck a plug onto it, put it into a normal wall switch and the pump stated to turn...i then turned the boiler on and it worked with no bangs, feeling quite chuffed with myself i went downstairs and announced my victory but about 1 hour later i was sweating like a paedophile....the thermostat doesnt do anything either!!!

so since then i have a low and high setting on the boiler, i set it to low and then turn it off after an hour or so and then turn it back on when i get cold lol, with the fan now in its last days i thought i might just change the whole dam thing?

the thermostat downstairs makes all the right noises but doesnt seem to be communicating with the boiler at all...i have had a look at the wireing at the back of the thermostat and these a whole fist full of wires that go in there, i dont know what ANY of those wires do so i admitted defeat on that one pretty much straight away, the wires that go to the pump are also as dead as a doornail

now if someone could tell me why those parts are doing this i would be inclined to keep the boiler and save myself the ballache of changing it, does anyone know lol???
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Old 21-09-2010, 02:08 PM   #10
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Answer

Quote:
Originally Posted by Bill Oddie View Post
ah, an educated opinion!!

from what i was told by the guys down this way with regards to me fitting my cooker was that the cooker had to be fitted "compently"...a lot of people just use the rubber flexihose to hook it up but i used copper pipe with soldered joints and i was told that this was 100% legal (is this true dick?)

what equipment is needed for setting up the gas pressure?, is there not a regulator in the boiler for this?

regards, brian
'Compently' is open to some interpretation, but if you have had instruction and experience(or under supervision by a competent person) then you can be deemed competent, however if something went tragically wrong you would be in front of a judge and have to prove that the work was carried out compentently by a competent person.
For commissioning boilers that are connected to the mains the burner pressure needs to be adjusted to suit the mains pressure which can vary from area to area and is usually carried out with bespoke gas pressure gauges. If this is not carried out then the boiler can run in-efficiently by wasting heat or not providing enough heat output. Usually there is two test points for a small rubber hose to slip over (you have to loosen or remove the plugs), one for pre-burner and one post burner, and they will need setting to values in the manual.
LPG installations are a little easier as you buy a boiler specifically for lpg or a conversion kit and set up the regulators on top of the bottles or bulk storage tank, and you find the burners are usually set up spot on.
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Old 21-09-2010, 02:10 PM   #11
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P.S. Try B&Q as they can have some good deals but it is very important to match the boiler size to suit the house, no of radiators, insulation. occupancy etc. Check on the web as I am sure there are tools to help.
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Old 21-09-2010, 02:26 PM   #12
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As for your thermostat problem you will need to ask for an electrician to check things over,. Normally new boilers are called to run by a timeswitch, the thermostat will then control the boiler and the boiler will supply power to the pump(this allows the pump to run on after the burner has switched off). It could be a simple thing like a knackered thermostat or a problem with the boiler controller. Try changing the thermostat for a start as they are cheap. Put up some close up pictures of the back of the thermostat and wiring and I can see if I can help with what the connections do.
Boilers will go bangbangbang after starting up when the circulation pump is not running which is why it stopped when you by-passed the pump supply. This could be thermostat related as it sounds like it has been wired up to control the pump directly which can cause the contacts in the thermostat to become welded after time.

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Old 21-09-2010, 02:31 PM   #13
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Quote:
Originally Posted by Dick_GTT View Post
As for your thermostat problem you will need to ask for an electrician to check things over,. Normally the boiler is called to run by a timeswitch, the thermostat will then control the boiler and the boiler will then supply power to the pump. It could be a simple thing like a knackered thermostat or a problem with the boiler controller. Try changing the thermostat for a start as they are cheap. Put up some close up pictures of the back of the thermostat and wiring and I can see if I can help with what the connections do
cheers mate, i think i might just do that!!
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Old 21-09-2010, 02:36 PM   #14
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Just edited last thread Bill Oddie
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Old 21-09-2010, 03:00 PM   #15
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Doing this from memory you should have 4 wires in your stat. Red, yellow, blue and green/yellow or bare copper. Red should be a permanant live, yellow is the switched live and blue the neutral, the earth wire will be the green or bare. That used to be the standard wiring for room stats. Its very easy to test the stat with an electrical tester. Plave one of the probes on the neural and then find the live that is permanant. The switched live will become live or dead as you rotate the stats dial.
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