Been told there is scale in my boiler/ CH circuit

[WaterTight]

Hi,

I have my boiler on a boiler plan with Baxi. The heating hadn't been turned on since spring (a rookie mistake no doubt.) Engineer visited but he was only there to service. I think he briefly called for heating while doing whatever he was doing and then said it went "crazy" noise wise and said it was scale. It was only quick, he didn't run it for more than 10 secs.

Hot water has been working fine whole time and still does.

He found out I was a plumber (mainly because I gave him an f+e to stand on) and so left me with some free chemicals to add to the system but wasn't too confident it would do much. He said pop them in the towel rad and let it circulate on high temp for as long as poss.

He said there's no need to drain down or anything else you can do.

It's a one bed flat, combi, 4 rads.

Before doing this I thought I'd check on here....Few questions

1. Is this all you'd do too?
(disclaimer: Skills/training wise I'm not gas safe and the only heating jobs I do are change rads and valves, no controls or pumps or stuff like that. so ultimately it's all i can do but i could always get someone else to do something else if it would help... )

2. If it makes a lot of noise should I just stick with it and let it circulate hoping it quietens down? Or stop and contact them.

3. Am I likely to lose hot water functionality - currently working - should the scale circulate and get stuck somewhere/do whatever damage it does internal to the boiler?

4. Would you add any other chems, different or more or proceed in a different way to the one he suggested?

Attached is pic of the chems.

Thanks

 

[Deleted member 120897]

What’s combi is it and does it have pressure?

 

[king of pipes]

You can't leave the cleaner in but it wouldn't hurt to spend a few hours replacing the system water and adding the boiler silencer, I had a in depth conversation with the fernox rep last week he said their chemicals are PH neutral so can't damage metals, the silencer can increase the thermal efficiency in a system and reduce noise, Before doing anything turn your boiler temperature to 50 °c and run the heating to make sure the diverter valve is working as it should ? Drain the system whilst hot and refill and inhibit. Kop

 

[WaterTight]

What’s combi is it and does it have pressure?

Baxi DuoTech Combi HE, yes. Working normally, pressure correct.

 

[WaterTight]

You can't leave the cleaner in but it wouldn't hurt to spend a few hours replacing the system water and adding the boiler silencer, I had a in depth conversation with the fernox rep last week he said their chemicals are PH neutral so can't damage metals, the silencer can increase the thermal efficiency in a system and reduce noise, Before doing anything turn your boiler temperature to 50 °c and run the heating to make sure the diverter valve is working as it should ? Drain the system whilst hot and refill and inhibit. Kop

He didn't say I couldn't leave the cleaner in. Thanks for the heads up. Just read the back of the bottle and it says "circulate for one hour, drain and flush." I don't have a flushing machine, never used one, is it worth me using it at all do you think?

 

[ShaunCorbs]

Does it make the noise when hot water is on / running ?

 

[king of pipes]

A good hot flush would do it only issues you ever get on them is the diverter valve leaking usual through muck in it they get a bit rattly with age add the silencer and a F1 inhibitor job done mate 👍. Kop

 

[WaterTight]

Does it make the noise when hot water is on / running ?

Not a peep.

 

[WaterTight]

A good hot flush would do it only issues you ever get on them is the diverter valve leaking usual through muck in it they get a bit rattly with age add the silencer and a F1 inhibitor job done mate 👍. Kop

Really appreciate the advice, thanks.

 

[WaterTight]

Just a thought but can you overdose the system on inhibitor? I mean if there is a scale problem would it be a bad idea to chuck in more than 1 bottle?