Combi boiler: my hot water has started running lukewarm.

[Phil the Fluter]

I have a Combi boiler and, a few minutes ago I turned on the hot tap in the kitchen and the water was far from hot. In fact, it was decidedly lukewarm.
I checked the boiler and the tap icon was lit up, showing it was delivering hot water to the taps and I could hear the boiler running and the temperature indicator was climbing from 50° to 54°. However, I checked my tap water with a thermometer and it was only 25°.
I also checked the water in the bathroom, and it was similar.
I have no idea what's wrong. Can anybody help?

 

[cjg]

has some one turned down your dhw knob

 

[Phil the Fluter]

Hello CJG,
No, nobody has been near the boiler but the interesting thing is that I've just been into the kitchen again and I turned the hot water on and it felt normal. I checked the temperature and it was 37°.
I think the boiler temperature for hot water is set to 44° so I don't know if that sort of drop in temperature is normal between the boiler and the kitchen tap.

 

[cjg]

mine is set at 50,, rememmber its getting colder outside so colder in let to combi it has to bring that temp up, but if you have to fast a flow on tap it will run cooler, turn tap down temp will go up
hope that explains thing.

 

[Phil the Fluter]

Thanks CJG, I understand what you're saying. I shall follow your advice.