Vaillant EcoTec Pro not reaching set temperature

[Emre]

Hello! We have 3 years old Vaillant boiler and recently we noticed that it's not reaching set temperature. I set the temp to 50 deg C, and then when we open the water, it starts burning and burns about 4-5 sec. then it stops. around 46 deg C. Water cools down a bit, then it starts burning again. this time burns about 2-3 sec and stops. I don't think it's related to temperature but it tries to burn and something make it stop. There is no error code on the screen. I will attach a video of the problem as well. I'll be appreciated if you can give me an idea what is it about. Thank you!

video: https://streamable.com/mfr5v4

 

[ianmcd]

Looks like your plate heat exchanger needs cleaned /replaced, lots of posts about this on here

 

[Emre]

Thank you Ian, for your prompt response. I better watch and learn about how to clean that part

 

[ianmcd]

If only 3 years old will probably still be in Warranty

 

[Emre]

Here in my country, warranty is valid for only 2 years. Btw is that heat exchanger plate only works for tap water usage? I just tried and my problem is also same for heating system.

 

[ianmcd]

Here in my country, warranty is valid for only 2 years. Btw is that heat exchanger plate only works for tap water usage? I just tried and my problem is also same for heating system.

Then it is not the plate heat exchanger then @ScottishGasMan will be able to offer better advice on this than me I have tagged him for you

 

[Deleted member 267285]

Try running the hot water or heating, and press the 2 top buttons, it might throw up a status code indicating an issue

 

[Emre]

ok I just did and it displays S14 while it's burning and then S13 when it stops

 

[Deleted member 267285]

Yes this is correct, wondered if it was going to show s53/s54.

 

[ScottishGasMan]

Still worth going into the installer menu and looking at the previous fault history, some faults log in there that down show on the main screen and can give a clue.

Its not any sort of blockage in the water ways, either an electronics fault or potentially a gas supply issue depending on if any fault is logged in the history

 

[Emre]

Hello @ScottishGasMan ! Thanks for your reply. I checked manual to see previous errors. So I entered Code 17 to reach installer menu and then by clicking right button twice I reach the menu " F ". However it doesn't display any error codes on that screen, instead it asks me to put a number. So I'm not sure if I was on the right screen.

 

[ScottishGasMan]

What country are you in? 99% this forum covers UK boilers 99% of the time, and there are often subtle differences in the boilers and software between different country's

 

[Emre]

I'm from Turkey. I just recorded another video to show how it's on my screen

video: https://streamable.com/0erxng

 

[ScottishGasMan]

When you get to the point in the fault history with the dashes, have you tried pressing + or - to see if it cycles through them?

On ours it will say no faults present normally, could be yours is different or could be some very unusual pcb fault

 

[Emre]

Yes! So all past 10 errors are same and F22. That's about water pressure right? From time to time, pressure was dropping under 0.8 and I was raising it up, so that shouldn't be related to my current problem. Seems like no error has been shown about the problem