Worcester Greenstar 24i issue

[DaveMargetts]

Hello - just wondering if anyone has any ideas why my Worcester 24i combi boiler doesn't heat the central heating water? It heats the tap water just fine but when the demand comes in from the room thermostat for the central heating to turn on - nothing happens... I've checked the demand from the thermostat is reaching the circuit board (240VAC upon request). I can see the diverter valve moving up and down during switch-on, so that seems OK, I've changed the mains circuit board so that doesn't seem to be the problem either. The blue indicator light is on steady and doesn't flash to show any errors. What I've noticed is that if I put the unit into 'maintenance mode' the central heating works and the radiators get hot, so it seems that the basic functionality of the system is OK... I suspect I have a faulty sensor somewhere but looking at the circuit diagram, I can't see an obvious culprit....

Any thoughts anyone?

PS I think the gaskets at the top and bottom of the heat exchanger may need replacing as they are 'oozing' out (see pics)- but not sure this has anything to do with my CH problem?

 

[Aquarius]

I think you’re boiler needs a service with the condition of those gaskets. I also urge you to stop messing around with a gas appliance. Did you perform a flue integrity check on the boiler after removing the cover? It’s a public open forum, it prevents us giving gas related advice to diy.

 

[DaveMargetts]

I think you’re boiler needs a service with the condition of those gaskets. I also urge you to stop messing around with a gas appliance. Did you perform a flue integrity check on the boiler after removing the cover? It’s a public open forum, it prevents us giving gas related advice to diy.

You may well be right about getting it serviced by a Pro, I've given my wife more than enough time to get it fixed and she's clearly out of her dept

 

[king of pipes]

You need a GSI to sort this one your boiler is boardering on dangerous I urgently suggest you get it looked at asap . Kop

 

[ShaunCorbs]

Tbh I would phone Worcester up for a fixed price repair as the heat engine looks Goosed / leaking they do have a 10 year warranty on them (the heat engine)

 

[Last Plumber]

Looks dangerous to me. Turn it off and get someone out to it asap. That's my advice.

 

[DaveMargetts]

Thanks for your wise words - I will most likely get it replaced.

 

[king of pipes]

Thanks for your wise words - I will most likely get it replaced.

The baxi 600 series would be a cost effective replacement .