Loud banging from Worcester Bosch Greenstar 24i Junior

[M.Joshi]

Thanks for everyone's replies so far.

We've just had a service on the boiler today - the D2 TRVs have been ordered.

I am a bit concerned that the service wasn't done properly. We paid £60 +VAT and this is all that was carried out:

Remove cover
Check gas pressure / boiler output
Clean out condensate trap
Visually inspect heat exchanger from outside

I mentioned that the hot water was extremely hot at the time of booking the service but, they were not able to find out what was causing this? They only identified that the hot water pressure was lower than the cold water pressure, the hot water was cloudy and that a filter? may be blocked in the boiler.

I thought that during a service the boiler should be stripped down and the heat exchanger inspected for any corrosion. Does £60 +VAT seem expensive for this service (NW London)?

They didn't carry out a flue combustion analysis - when I asked why not, they said it wasn't required on a standard service. Their meter was away for cal. but they could do this at a later date!

So, is the above list all that is required for a full service?

 

[Millsy 82]

If you carry out a full strip down service you have to swap all the gaskets/seals that are touched. They should have carried out a flue analysis as you cant see the flame in the boiler so have no way of telling if it is burning correctly. My company charge £70 and thats not in London (so a fair price but has not been carried out correctly) and unless it doesnt look right on analysis I dont strip them.

 

[RPG 80]

If you carry out a full strip down service you have to swap all the gaskets/seals that are touched. They should have carried out a flue analysis as you cant see the flame in the boiler so have no way of telling if it is burning correctly. My company charge £70 and thats not in London (so a fair price but has not been carried out correctly) and unless it doesnt look right on analysis I dont strip them.

Agreed its best practice to use a gas analyiser, but the reason you gas rate the appliance is to tell if it is burning correctly ie +/- 5% of heat input.

 

[Millsy 82]

I was always taught that the gas rate just shows you that its using the correct amount of gas not that its burning correctly.

On these boilers I do
1.Flue analysis on high flame (case off) adjust as needed
2.Flue analysis on low flame (case off) adjust as needed
3.Gas rate
4.Flue analysis on both high and low flame case on if a seal has gone in the boiler or flue the co/co2 will start to rise. you do tend to find quite alot of problems Ive had split flues, split seals, flues not put together correctly etc.

I might just be being fussy but better to cover yourself

 

[M.Joshi]

Does anyone have an idea what might be causing the excessively hot water?

Thanks.

 

[SafeGasInstall]

you contacted me for a service and turn down my quote , now you see is going to cost you much more to do a simple service which i could have provide you with ! hot water comes at set temperature on this boiler , if you want to be able to adjust temperature on this boiler then should have picked up better boiler ! also they should have install the nox chip as you have 3 rads !

 

[M.Joshi]

£85 labour plus £35 materials +VAT seemed a little expensive. I also didn't understand what you meant by this: "Should any of the parameters of the fun or product of combustion are out then will be second visit". "Fun parameters are -3.5 -7.00 mbar of a negative pressure !"

I am aware that there is no external hot water dial on this boiler. The water hasn't ever been this hot before and therefore not a problem. As I understand, the hot water should automatically be regualated to a safe temperature on this boiler.

I thought this Worcester Bosch boiler was good at the time of purchase?

What is a 'nox' chip?

 

[SafeGasInstall]

good luck now 🙂

 

[tweakyboy]

You need to do a check on this boiler to tell you if the heat exchanger needs cleaning, you do it by putting your manometer on the fan pressure test point when the boiler is in service mode on maximum. For the 24i Junior it should be lower than -3.1mb. If this is ok and your analyser readings are all good I don't see any point in doing a strip down of the heat exchanger it means the customer has to pay more for seals/unnecessary work, but I still do all the working pressures/gas rates/condensate trap clean out/etc.

I agree with SGI on this a low NOX plug should have been installed and SGI is correct about the fan negative pressures as you can see I have mentioned above!

 

[SafeGasInstall]

£85 labour
£35 materials
this was for a full service ,
the bit you did not understand was if you were going to have a normal check on your boiler which would have cost you £50+vat !

 

[SafeGasInstall]

is next to your flux switch , google it and you can fit it your self 🙂

 

[M.Joshi]

is next to your flux switch , google it and you can fit it your self 🙂

Flux switch - haven't ever heard of such a thing?

 

[SafeGasInstall]

you are not a potential customer M.Joshi , you had your chance to use my services now enjoy the forum and google and I hope you have a good evening 🙂

 

[gassafe]

Whats the deal with that Nox chip i keeo finding in the Worcester Boilers? I have not ever fitted one. What are the benefits?

 

[SafeGasInstall]

keeps the out put low

 

[M.Joshi]

This is what I hate - cocky plumbers! I have no quarms about helping people on forums even though I am not in the trade. It is people like SGI that put you off believing there are genuine and honest people in the trade.

I have never heard of 'parameters of fun' and a 'flux switch' before. Could somebody please clarify?

 

[SafeGasInstall]

fun creates negative pressure , and if there is restrictions in the burner the pressure will get lower therefore boiler needs a good clean ,
ist the forum good , you can write and then delete your post 🙂

 

[SafeGasInstall]

by the way I am honest person and you have not got a right to make such a comment here , you dont know me ,you have never met me in you live !!! how could you come up with some thing like this ! I am well respected engineer M.Joshi

 

[M.Joshi]

fun creates negative pressure , and if there is restrictions in the burner the pressure will get lower therefore boiler needs a good clean ,
ist the forum good , you can write and then delete your post

Yes quite - you can choose to be more polite.

Is 'fun' short for something?

 

[SafeGasInstall]

"fun"-fan ( spelling issue )