Why Does Vaillant EcoTec 832 Boiler Only Heat in Chimney Sweep Mode?

[MilkyBadger]

Hello everyone,

I'm facing an issue with my Vaillant EcoTec 832 boiler and would greatly appreciate your expert advice.

The Problem:

• Heating Not Working Normally. When I turn on the heating, it doesn’t start. However, I still receive hot water, suggesting the boiler does work in some capacity..

What I've Tried:

• Chimney Sweep Mode: Interestingly, when I activate the 'chimney sweep' setting, the heating does come on.
• Pressure Check: I’ve had difficulties firing up heating after a long time off before. Usually it's because the pressure has dropped right down. I opened up the filling loop to bring it back up to pressure but it didn't do the trick this time.
• Resetting the boiler: Attempted a boiler reset to default settings by pressing the button on the front. I also tried turning it off and on again.

I haven’t delved into any complex internal components for safety reasons. Above is pretty much the limit of my skills with this machine. I'm seeking guidance on what might be causing this issue and how I might resolve it or if it’s time to call in a professional.

Thank you in advance for your time and advice!

 

[ShaunCorbs]

Port valve probably I’m guessing heat/ system boiler ?

 

[MilkyBadger]

Port valve probably I’m guessing heat/ system boiler ?

Thanks for your help. Is the port valve the same as the diverter? I wondered if that was the issue. It’s a small combi boiler. Is there a way to test this? Or is it time to call an engineer?

 

[ShaunCorbs]

It’s not a summer mode by any chance eg hot water only ?

 

[MilkyBadger]

It’s not a summer mode by any chance eg hot water only ?

I had a look for a summer setting but not sure there is one. Heating is turned on with manual switch. No icon displaying summer mode active either

 

[ShaunCorbs]

Room stat ?

 

[MilkyBadger]

Room stat ?

We had a thermostat but threw it away as it didn’t seem to work. But that was years ago and since then it’s usually been okay to just turn it on manually. But maybe a control issue?

 

[ShaunCorbs]

Could be

Needs a engineer to test ideally

 

[MilkyBadger]

Could be

Needs a engineer to test ideally

Yep I think that’s got to be the next step. I appreciate your help with this!