Can't Increase Heat On Boiler...

[michty6ty6]

I've got a combi boiler and in the winter the water could be hotter in the shower - but it won't let me turn the water temperature up. Here's what it looks like - I can get it to show where it is set but nothing happens when I press 'hotter' - if I hold it down, press it multiple times - it doesn't matter. It won't budge.

Any suggestions?

 

[Jadnashua]

If you have not ever demineralized the heat exchanger, that may be your problem. Knowing the brand and model number would help.

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[Sponsor]

 

[Dana]

Model numbers and names are useful in these types of discussions.