Not HOT water without boost

Hi

My boiler is make a loud rumbling... The noise it usually makes after taking a shower or filling the sink except it doesn't stop. Also, I'm unable to get hot water. I can get warm water but it's not hot.

Also, the closet the boiler is in isn't warm any more, just room temperature.

I am able to get hot water if I use the boost button which also stops the rumbling.

Anyone have any ideas?

I hasn't been working for 4 days but it is today...

Anyone have any idea what this might be?

It worked for 12 hours, back to normal now

Help really appreciated.

Hi rob2kewl,

Sounds like my issue is very similar to yours:
https://gledhill-repairs.forumotion.net/t1904-only-hot-water-with-boost-quote-wanted-watford-area

Did you find a fix in the end or did it go back to working correctly?

Shaun