Combi Boiler Issues

[Wishfullthinker]

Need Help, I have an Intesa 23 Combi Boiler (rebadged Ariston), it has suddenly taken on a life of its own.

Totally ignores room thermostat settings, when tap is turned on the Hot water runs for a coulpe of seconds and then goes cold. Has had a service.

 

[Hardy Sparky (Mvc)]

First i would Check that the white plastic outlet pipe not frozen, if not then check the pressure and there is any fault codes ?

 

[Wishfullthinker]

Pressure ok, pipe not frozen or blocked

 

[Barx]

If you run the hot tap does the heating flow pipe that exits the boiler get hot?

 

[Wishfullthinker]

Stays hot for a few seconds and then goes cold, the boiler has two settings ( by way of two push buttons on front panel ) one for summer and one for winter, when in the summer mode the boiler is still feeding the central heating system

 

[Barx]

Once cold does

a) it come hot again if you keep running tap

B) boiler shut down?

 

[Wishfullthinker]

comes hot for few seconds sometime then goes cold, boiler then reverts to central heating

 

[Barx]

Well, I'm no boiler engineer but:

Heating works ok, so flame and ignition system should be ok.

The fact it actually switches back to heating would lead me to believe the diverter valve is ok.

If it was me, I would be putting my money on the water flow switch

Just my thoughts. Please sign the disclaimer below!

DISCLAIMER

I hereby sign to say that I will not hold Barx (Legally Known as Mr D. Barker) liable to any damaged I cause to my boiler following his advice.

Signed........................... Mr W. Thinker

 

[batty]

So was it working OK before the service has it worked OK after the service.

 

[ga55man]

hi ! if the heating pipe gets hot while you are running the hot water on a combi then the diverter valve is letting by .if the heating pipe gets hot more than 6inchs down the pipe {blatant flow} also if it doesnt and the water goes cold does the boiler go out ?because it may be down to a partially blocked plate heat exchanger and is shutting down on return temp! THIS DOES reuire a GAS SAFE engineer though if it is a gas boiler

 

[steptoe]

well, for my tuppence,

diverter valve?

mine was doing the exact same, had a couple of guys out, NO idea and just more expense,

posted on here and the late JL told me exactly what the problem was,

 

[Simon Czaban]

Hi Wishfullthinker. How old is your boiler by the way? Coz over time, boilers do lose their efficiency and you start to experience problems. If your system is old or you suspect a more serious issue, it may be worth calling a qualified heating engineer to help you out.