vaillant ecotec 831 S53 !!

[RoryD]

Boiler banging and crashing;Was able to easily stop the pump; found plenty of sludge residue in secondary Heat Exchanger. Fitted magnaclean, Magnacleansed system, replaced pump & 2ndary h/ exchanger. All fires well, heat circulates well. On DHW the water is luke warm 35ish degrees. Boiler modulates low. discovered S53 and all that goes with it. Read H/ exchanger is an issue & software fault. Others mention adjust the bypass. If anyone does know please help me out. Thanks.

 

[Jay Jay]

If sludged up likely to be main hex, sadly you can’t fully clean them, as they split to 3/5 coils .
Hope this helps

 

[RoryD]

If sludged up likely to be main hex, sadly you can’t fully clean them, as they split to 3/5 coils .
Hope this helps

Thank you Jay. I have an update.
It seems Vaillant Technical help isn't what it used to be. They inform to clean the boiler out thoroughly and check the Thermistors, which seems a pretty standard response.
I returned today cleaned out much of everything..there was some deposits not as bad as I thought it would be.
I then opened the by pass by just over a turn which would help to increase flow across the boiler and prevent this over engineered issue. It worked. I could have saved myself a lot of trouble by doing this instead of stripping / cleaning the boiler pipes and block where I could.

 

[ShaunCorbs]

did you clean the bypass as ive seen a few that were restricted

 

[RoryD]

did you clean the bypass as ive seen a few that were restricted

No Shaun, just decided to give it a try and it worked very well. It was just over a turn. It's an issue I suspect will raise it's head more frequently. It seemed to be a different Plate to plate. May not be the reason but just seems coincidental. Either way the by pass is the solution.

 

[Vee]

Sludge sticks in the rubber hose parts, unless they have been replaced with coppers.

 

[RoryD]

Sludge sticks in the rubber hose parts, unless they have been replaced with coppers.

Yes mate, that was all checked and was fine. Found a "workaround" as above.