Baxi 80e, h/w alternates between hot/cold - H/E or diverter?

[diydunce2010]

I have a problem that I'd like to get some advice on and some professional help to fix.

The hot water on my Baxi 80e alternates between hot and cold. Boiler is 9 yrs old and problems started after some rads were removed and put back on. I'm in a hard water area, though water in the rads was very clean - even remarked on by our plumber. I checked a lot of threads and they all say it is a furry heat exchanger, though, when an engineer checked it out, the CH pipe got hot (h/w pipe was lukewarm) and he couldn't tell whether it was the H/E or diverter valve. He said it wasn't the diaphragm. I couldn't find a thread that mentioned this.

He quoted approx 700 quid to replace H/E and diverter, though I only want to replace the defective part. How to check whether it's the H/E or diverter valve that's faulty? There must be a better way than trial and error, ie install a new component then seeing what happens.

And, for 700 quid to fix a boiler, would I be better off getting a new one? I didn't get a quote on that. Thanks.

 

[powell30]

700!!

If when you call for hw your flow pipe on the rads side starts to heat up then it's the diverter valve.

If it doesn't and the boiler cycles on off constantly then it's likely to be a sludged/scaled plate heat ex

If i changed both (about 150) then it's an hours work, maybe 2 if acces is awkward. Call labour 100-150.

300 tops

 

[namsag]

Tell him to F off, the divertor is £65 PLUS VAT and the heat ex is £35 PLUS VAT.
So even loading the parts they should not even be near 200.
The heat exchanger takes 5 mins to fit and the divertor a max of an hour.



A new 105he that would fit onto your existing jig would only cost £605 including vat

He is taking the pish saying 700