the gas stove does not heat the radiators (it only heats the water)

Hello, I have a problem with the Vaillant gas stove. I don't know how to identify it, but I think VC / VCW 878/1. I am totally green on the subject, the apartment is not mine.
There was a drop in pressure, I refilled the water and it came back to 1.7 and theoretically it should be ok. Since then it does not work as it should.

The Auraton 2020 thermostat works, the display shows that it should heat (not heat) in both auto and manual modes. You can hear the stove as if it was about to fire up and heat up, but it consistently doesn't. I replaced the batteries. It warms the hot water.

Any ideas before I call a service technician and spend my money? The review was in July.

Thank you and please no hate.

Maybe you just have air on the radiators.

heniek07 wrote:

Maybe you just have air on the radiators.

checked - I checked by unscrewing it gently with a key - all of them are flowing with water, so they should be ok

Analyze, look at everything, the pump, some valves, sensors, connections, control electronics, etc. I have a more traditional installation and it's hard to judge how yours is done if you don't see it. The stove heats your water in the boiler, it must be something with the main CO circuit. Wait, maybe professional plumbers have their say.

View of the furnace in the attachment

Beautiful glaze, it looks like a bathroom and a gas stove only for heating hot water. Are you sure you have CO heating from this stove?

it is a kitchen and it is 100% water + co

Give a photo from a further perspective. My ideas are over. Maybe the professionals will finally advise you. Regards. Good luck!

This is probably the VCW 180 boiler. You have to remove the casing and the front panel, and there is an unlocking button behind the pump. It is possible that when the pressure dropped, the water boiled and the protection was activated.

Ok, I called a service technician. The diaphragm was to be replaced.

Thanks for the help