Worcester Bosch Boiler problem

[RidleyRumpus]

I hope you can help.

I have a Worcester Bosch Combi boiler Eco Greenstar 30i

A day or so ago it stopped providing hot water so I checked the pressure and the gauge was near zero, so I repressurised the system (2nd time in 4 years) but the problem still persists.

What happens is you turn the tap on, it calls for heat and the boiler fires up, temps rise and on the temp dial on the front it gets into the 90's and shuts off, few seconds later it recycles and tries again.

If I press the "info" button it says "flow control sensor fault", which makes sense.

Anything I can try of is it an engineer call out?

(I also reset the boiler)

 

[terryplumb]

You need an engineer to visit.
What's the temperature of the water coming out the hot tap?

 

[RidleyRumpus]

You need an engineer to visit.
What's the temperature of the water coming out the hot tap?

It starts to get hot, then the boiler cuts out so it goes cold, then the boiler cuts in, repeat.

 

[terryplumb]

Could be a number of things including a blocked heat exchanger ,does it run for central heating , not that I expect you would have it on in this weather ?

 

[RidleyRumpus]

Could be a number of things including a blocked heat exchanger ,does it run for central heating , not that I expect you would have it on in this weather ?

I just turned on the heating for around an hour, seems to work fine.

Got up to temp in the loop and has stayed there.

 

[terryplumb]

I would suspect a blocked plate heat exchanger.

 

[RidleyRumpus]

I would suspect a blocked plate heat exchanger.

Even though the central heating is running fine?

Doesn't the central heating use the heat exchanger then?

 

[terryplumb]

The plate heat exchanger is where the cold mains water is heated as it passes through on its way to hot water taps,it has no part in the central heating function.

 

[RidleyRumpus]

The plate heat exchanger is where the cold mains water is heated as it passes through on its way to hot water taps,it has no part in the central heating function.

What sort of costs am I looking at to replace?

 

[terryplumb]

Couple of hundred quid most likely, probably more if you are in/ around London.

 

[Arkanoid]

Jeez got a similar issue and a guy has quoted almost £500 and said it might not even fix it and I should think about a new boiler, think they might be having me on

 

[terryplumb]

How old is your boiler ?

 

[Arkanoid]

mines less than 5 years but not under warranty as we bought the house 2 years ago and the last owner hadn't kept up servicing

 

[Arkanoid]

It had been running at really low pressure and hadn't noticed though so idk if i've screwed it by doing that for too long (or if previous tenants had)

 

[terryplumb]

You should start your own thread and give us more info ,rather than taking this one off topic.