Main Combi 30 Eco - hot water is cool?

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13 Oct 2021
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United Kingdom
The HW is not reaching the temp set on boiler, also have to run hot tap a long while before it gets any degree of hot water through. Central heating radiator temp is OK.
Any ideas? Thermostat on boiler?
 
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See is the 22mm central heating pipe on the left under the boiler gets hot when you run a tap, if it does its a sticking diverter valve.
 

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