Loud banging from Worcester Bosch Greenstar 24i Junior

[M.Joshi]

"fun"-fan ( spelling issue )

Oh, I see! However, mbar is generally associated with gas pressures not fan rotation?

What about 'flux switch'?

 

[Gray0689]

M joshi SGI gave you a price and you didn't take it you got another company in for less money and you still have problems
Do you really expect him to now tell you the problem for free????
Don't see any comment as cocky apart from yours this is a gas boiler that legally you can not work on so why should you be told what the problem may be I'm sorry you didn't get a decent plumber in on the first place but if you want it sorted once and for all I'd do a bit of apologising to SGI

 

[Roger Welton]

Oh, I see! However, mbar is generally associated with gas pressures not fan rotation?

What about 'flux switch'?

mbar = 'millibar' just a unit of measure is used for lots of things including in the weather forecasts

 

[M.Joshi]

M joshi SGI gave you a price and you didn't take it you got another company in for less money and you still have problems
Do you really expect him to now tell you the problem for free????
Don't see any comment as cocky apart from yours this is a gas boiler that legally you can not work on so why should you be told what the problem may be I'm sorry you didn't get a decent plumber in on the first place but if you want it sorted once and for all I'd do a bit of apologising to SGI

I thought I hired what was a good Gas Safe Registered company to do the service - turns out that they didn't do the service correctly. When I saw 'fun parameters' and 'flux switch' mentioned, I assumed these were absurd comments. If I am wrong, please correct me.

I don't intend to repair the fault myself and wouldn't touch any gas parts. Besides, I've heard that the hydraulic block is a nightmare to remove on this model anyway.

I am not asking anyone to repair the boiler for free. Just after some genuine advice so that I'm not fobbed off. I have provided advice to other users on this forum without any sly remarks and expect the same from other members regardless of their experience level or number of posts.

 

[M.Joshi]

Incidentally, thank you to SimonJohns, dancinplumba, Roger Welton, glenno1, cdodds2004, Millsy 82, RPG 80 and tweakyboy for their advice on this post so far :icon14:

 

[SimonJohns]

Did I do good?

 

[M.Joshi]

Did I do good?

SimonJohns, you were the first person to reply to the post suggesting a faulty TRV.

 

[SimonJohns]

SimonJohns, you were the first person to reply to the post suggesting a faulty TRV.

Was I right?

 

[M.Joshi]

Was I right?

The TRVs haven't been replaced yet! We just tweak one of the radiator valves when the noise occurs.

 

[GrahamM]

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?

Just had a quick re-run through the thread.
I had it in my head that this was a Worcester Junior 24i as per the title and have just realised it is a Worcester Greenstar 24i Junior. Is this correct?

If so; how can the engineer you had do the so called service confirm safe operation of a Zero governed boiler if no flue analysis was carried out? If this is the case you have been stung in my opinion. You have paid for someone to look at your boiler and say "I think it is running ok"!

 

[M.Joshi]

GrahamM, you are right, the boiler is indeed a Greenstar 24i Junior. I can't see a way of changing the title of the post now?

When I questioned them why they didn't do a flue gas analysis, they said it wasn't required. They said that they can check the correct burning by observing the gas flame and checking around the flue for cracks/vapour! They also said that their gas analyser was away for calibration and would be back in a week - this sounds to me like they probably don't have one. I kept stating to them that all other companies carry out a flue gas analysis as a preliminary check for a service. They said that it wasn't required.

I have sent them the manufacturer's installers and service manual which indicates that the flue gas analysis should be checked and the primary heat exchanger dismantled and cleaned during an annual service.

 

[M.Joshi]

Regarding the NOx (Nitrogen Oxide) code plug - the boiler was purchased around 5/6 years ago and I don't know if Worcester Bosch Greenstar 24i Junior boilers were supplied with them then?

 

[SimonJohns]

Not hey were not. Only last 2 years

 

[SafeGasInstall]

I have few in the van 🙂

 

[mikegas]

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

Just a note when adjusting the gas valve high an low, always finish on high as adjusting the low can affect the high, not saying you don't do this, just pointing it out for others that might not

 

[Millsy 82]

M.Joshi got quotes picked 1 then went with it ok probably didnt quite say the right thing when getting a price but then how many customers do ring up and say I want a full strip down service of my worcester greenstar 24i junior they just phone up and say I want a boiler service. He went for a gas safe engineer who has come out and not carried out an essential check on the boiler that is not his fault I am sure that with hindsight he would have gone with SGI and pay the extra but then hindsight is a great thing.

Alot of people look and see gas safe and automatically expect (rightly so) that the engineer is competant but I bet every engineer on here knows people that you wouldnt ever trust but they still get work. It is so hard for the customer to get quality engineers with the amount of useless people out there.

£120 for a strip down is not expensive. If I worked for myself then I probably wouldnt charge that much but wouldnt be far off.

Anyway for your hot water problem really you need to check the flow rate out of the taps and temperature and compare it to MI

 

[M.Joshi]

Millsy 82 - Below is what I posted on MyBuilder - where I came across the company in question. They also seemed quite proactive in calling and keen to do the service as soon as possible hence, why I chose them! I did confirm that the service would be carried out by a Gas Safe Registered person.

Should I have worded my request differently?

---------
We would like someone to do a full service on our Worcester Bosch Junior 24i boiler. Note a full service is required, not just an inspection or check i.e ensure all parts are working correctly, inspect heat exchanger and replace gasket as necessary.
The hot water from the boiler is occasionally coming out extremely hot. There are no hot water controls on this boiler.
---------

 

[Millsy 82]

I would take that as a full strip down service I would phone them and get them back to finish the job and do it properly with flue analysis.

 

[SimonG]

Well there's your problem 'mybuilder'.

Did you check there gas safe credentials?

 

[M.Joshi]

So how much should I roughly be looking to pay to have a strip-down service and rectify the hot water problem in the NW London area?

Is the NOx code plug expensive to retrofit on this boiler?

Also, how much should I be paying to have a couple of TRVs replaced too?

Thanks.