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Engineer has been. He tried different partial loads and it does the same thing. Temperature spikes and then error code. He put it back in auto mode and it was working normally again. He said he would pop back later with some NCT sensors or something? Any further insight I could relay to him...

I will message the engineer and see when he can pop round.

He did loads of stuff in three hours. The motor from the leaking diverter valve. He tried both motors and I could see the pin moving up and down and he tried both but the issue still persisted. Only fixed in auto mode but the underlying issue is still present.

Change it from auto to 16kw? The engineer did try the 14kw again but it was giving the temperature spike issues.

I should add. Boiler is about 10 years old. It has only needed a replacement leaking diverter valve about 4 years ago. Has worked perfect since then and before then.

3 large column radiators. 3 doubles and 1 smaller one. The engineer had put it down to 14kw 10 years ago. I can’t remember how he worked it out but said the size etc of your radiators you only need 12-14kw.

Hi everyone, looking for some advice on a stubborn Vaillant EcoTec 837 issue. The History:A few weeks ago, I was getting constant low pressure and F.75 errors. My regular, reliable engineer found a leaking diverter valve. While fixing it, he replaced the diverter valve, pressure sensor, and...