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Brian, Plumber
Category: Plumbing
Satisfied Customers: 872
Experience:  16 yrs. experience as plumber, including full bathroom and kitchen installations.
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Water temp set to 65 deg Water won’t heat to higher than 49

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Water temp set to 65 deg
Water won’t heat to higher than 49 deg
CH fine

Hi we need to know what boiler it is please Combi or do you have an immersion cylinder

if you have an immersion cylinder try turning the boiler temperature up to about 72c if that doesn't help then it is possibly the thermostat faulty

if you have a combi then you probably need to check the thermistors

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Customer: replied 4 months ago.
Can’t set temp higher than 65.
It’s a Vaillant Pro Tec combi
Water heats up normally when CH is on