Boiler Error Code - Advice - Vaillant EcoTec 831

DIYhelp76

Hi,

We have a Vaillant EcoTEc 831 gas boiler - approx. 18 years old.  Keeps throwing up error codes and stopping working.  We have used the reset button and it always restarts. This has been happening for several years from time to time.

This year, and the last few weeks especially, it stops every week, sometimes every other day.  Turning if off at mains overnight and using reset button usually gets it going again, but sometimes lately it can take 5-6 reset attempts.

It is properly pressured and was serviced last year.

Is there a Vaillant expert who could help diagnose fault and say if it's worth repairing or replacing - and likely costs for both option?  Would like to avoid unnecessary cost and upheaval of a replacement, if a repair could be viable.  Saw some comments online to say it might only be a "capacitator" on the PCB that needs replacing at minimal cost, but not sure how to diagnose.

Many thx for any advice on this.

ic

What are the error codes?

FreeBear

DIYhelp76 said:  Would like to avoid unnecessary cost and upheaval of a replacement, if a repair could be viable.  Saw some comments online to say it might only be a "capacitator" on the PCB that needs replacing at minimal cost, but not sure how to diagnose.

Finding a faulty capacitor and replacing it is beyond the skillset of most heating engineers. You could probably find a refurbished board at a reasonable price (you usually have to send the old board back to get the best price). But you may find many Gas Safe engineers won't fit a part that you have supplied.

Not all faults are within the main PCB. Faulty sensors can also throw up cryptic error codes. Depending on the errors being displayed, it may pay to get Vaillant to do a fixed price repair.