Glowworm Ultimate - descale heat exchanger ?

[russellhayward]

Have a Glowworm Ultimate 120ff, heat exchanger is fizzing and gurgling and kettleing

Can I add treatment to the system to cure ? or do I need a powerflush ?

I have drained down the system and added inhibitor in the past etc so know how to do it.

If I can do it manually which chemicals should I use for best results.

Many thanks !

 

[gassafeman]

Fernox DS40.

Follow the instuctions though!

Paul.

 

[russellhayward]

Now ready for my DS40 treatment.

I think I would like to isolate the boiler as far as possible, is this a case of closing the TRV's and lockshields on most of the rads ?

Also what is the best length of time to circulate for, instructions are a bit vague.

 

[russellhayward]

Anyone please ?