Vaillant EcoTec 831 intermittant noise

[Deleted member 32524]

Hello,

Thanks for looking. Got called to above to a report of it making a noise, intermittently, no fault codes. Checked CO2 levels and it was at 8.5%, put it to 9.0% as per MI. Thought that would cure it, but no. Had a call today to say its back. I have not heard a peep? Runs smoothly when I was there.
Any thoughts before I go back? Thank you. Duncan.

 

[Harvest Fields]

Pump/diverter maybe?

 

[Deleted member 32524]

I put screwdriver on pump it when I was there and it sounded smooth. What you thinking on diverter? Passing or maybe getting a stray signal?

 

[Harvest Fields]

I put screwdriver on pump it when I was there and it sounded smooth. What you thinking on diverter? Passing or maybe getting a stray signal?

Is it a whistling sound or vibrating sound?

 

[Deleted member 32524]

from her description its a vibrating with a bit of a rattle. No whistling. Thanks. D

 

[Harvest Fields]

Does it happen at a specific time of day?

 

[Deleted member 32524]

? intermittent. Might not do it for days.

 

[Harvest Fields]

May just be muck in the system but I have heard of intermittent noisy pumps and diverter on here before.

 

[Deleted member 32524]

Sounds like I may have to stand at it till it does it, but probably a waste of time.

 

[Last Plumber]

Sounds like I may have to stand at it till it does it, but probably a waste of time.

If it is like a trombone that increases and then fades, it is to do with combustion.
You will obviously need to hear it yourself though.
I have had a few that do it over the years.
Have you tried running on P1? when you are there?

 

[Deleted member 32524]

I have not been able to hear it. Analyser readings were from memory 0.0009, co 101, co2 9.o, defo 9.o Combustion seems ok. I have not had burner out though. Not been on p1.

 

[Scott_D]

Internal bypass?

 

[townfanjon]

Its like going to the docs to describe pain.., you have to know what sort of noise it is , lol
Get the customer to video it perhaps