DIY heating cleaner

[Dion23]

Boiler saga! My Baxi 33 is 7 years old and stated making kettling sounds. British Gas replaced the heat exchanger but made no difference. They insisted it needed £1000 power flush! I’ve since added sentinel x200 as that works perfectly for about 6-8 weeks and noise comes back.
Can I add sentinel x400 cleaner and just leave in ? Will the mag filter collect the junk? If not is the a simple way to flush out the x400?
Thanks

 

[CBW]

No you can leave the cleaner in. The only one I know that you can do that with is Calchem. Maybe try an independent engineer?

 

[Dion23]

So maybe worth giving calchem 3 in 1 a go?

 

[CBW]

So maybe worth giving calchem 3 in 1 a go?

Debatable. Depends how blocked the heating and or exchanger is.

 

[Dion23]

Heat exchanger is brand new, system is only Noisey for about 10-15 mins then runs normally

 

[CBW]

Heat exchanger is brand new, system is only Noisey for about 10-15 mins then runs normally

You could try it fir the price then.

 

[gas112]

DUOTEC combi 33 ?

 

[Dion23]

Yes, that’s the model

 

[foxhole]

Heat exchanger is brand new, system is only Noisey for about 10-15 mins then runs normally

Sounds like air in the system.Is the boiler mounted at a high point ( like upper floor, loft?)

 

[gas112]

Yes, that’s the model

there is a filter in the return isolating valve that clogs up .
loads miss it and it only takes 5 minutes to clean .
Perfectly ok to leave 400 in it wont cause any issues
Might be worth changing the main sensor that sits in a dry pocket as it might be out of calibration stopping boiler modulating correctly , so no need to drain down takes 2 mins .

Baxi Domestic Hot Water Negative Temperature Coefficient Sensor 5114725

This product has been discontinued and replaced by product code 666852. The Baxi thermistor sensor decreases circuit resistance in line with temperature increases. The printed control board (PCB) of a boiler provides a current to the thermistor, reading the relative resistance to determine if a...

www.cityplumbing.co.uk

 

[Dion23]

Sounds like air in the system.Is the boiler mounted at a high point ( like upper floor, loft?)

It is in the loft yes

 

[foxhole]

Might be worth bleeding air in loft as that can cause noisy start ups before the system starts pumping it around ( it then dissipates until next start when the air slowly returns to high spot.

 

[Dion23]

Might be worth bleeding air in loft as that can cause noisy start ups before the system starts pumping it around ( it then dissipates until next start when the air slowly returns to high spot.

Bleeding air in loft? Not sure I understand

 

[foxhole]

Bleeding air in loft? Not sure I understand

At the boiler.

 

[gas112]

At the boiler.

where on the boiler ? it has an auto airvent on it