Loud banging from Worcester Bosch Greenstar 24i Junior

[Gray0689]

Ask SGI if your really nice he may come and sort it out for you

 

[M.Joshi]

Ask SGI if your really nice he may come and sort it out for you

I doubt it:

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 🙂

 

[GQuigley67]

the hot water temperature is pre-set on these boilers, can get really hot i would suggest fitting a TMV to get around the issue, or having thermostatic mixer taps fitted.

one of the reasons i dont like worcester juniors, i like to be able to control the hot water temp on my boilers 🙂

 

[M.Joshi]

the hot water temperature is pre-set on these boilers

It has been fine for all these years but recently, the water has become excessively hot and slightly cloudy?

 

[Millsy 82]

The maximum temperature they should get to is 55 put a thermometer under it and check that. It might be that your plate is starting to scale up and slowing the flow rate down meaning it has more time to heat up the water

 

[GQuigley67]

55 is still too hot if you ask me, that's why i prefer to have hot water control on boilers

 

[M.Joshi]

According to Worcester Bosch technical, the low NOx code plug can only be used on the newer software pcb. So, it seems we won't be able to have it fitted on our boiler!

 

[Chalmers7]

The maximum temperature they should get to is 55 put a thermometer under it and check that. It might be that your plate is starting to scale up and slowing the flow rate down meaning it has more time to heat up the water

I agree with Millsy your plate sounds like its scaling up giving you a slower flow rate and causing you to get scalding water. Another thing, if you have had your water main stop valve shut off recently and haven't opened it up fully again causing a slower flow rate through the boiler gives u scalding water. Have seen it be simple like this before, hope this helps.

 

[M.Joshi]

Is this simply a matter of running de-scaling chemicals for a few days through the system or is a more complex de-scaling procedure required?

I don't think the cold water stop valve has been touched recently. The cold water pressure seems to be fine. Just slightly restricted hot water pressure, a little cloudy and extremely hot.

 

[Millsy 82]

Your plate heat has 2 sides the mains water side and the heating side if it is scaled up then its the mains side of it so running descaler through your heating system wont do anything you can remove the plate and pour descaler in the mains side but i'd recommend replacing the plate. What you really need to know is the flow rate that you have coming out of the taps as by eye you wouldnt notice the difference between 11 and 9 litres per minute.

 

[M.Joshi]

Can I measure the flow rate easily without one of those special cup meters?

 

[Millsy 82]

No you need a flow cup to test it

 

[Millsy 82]

Sorry I was wrong you can fill a bucket and time it never done it myself

 

[RPG 80]

Run the tap until it gets hot, then fill a bucket from your hot tap for 60 seconds, then decant the bucket into a measuring jug eg 1 litre at a time and this will provide your flow rate.

 

[cdodds2004]

flow rate of a 24jnr is around 9.8litres i thinnk, its defo less than 10

 

[M.Joshi]

Someone checked the flow rate of the hot water for me today - it was around 5 litres/minute. As cdodds2004 mentioned in the previous post, it should be 9.8 litres/minute.

It was suggested that a clogged diverter valve could be the cause - is this likely?

 

[SafeGasInstall]

no , blocked filter

 

[M.Joshi]

Edit: Do you mean the small filter inside the turbine?