Hello all,
I have recently inherited a SIME SUPER 90 combination boiler in a house I moved into.

The boiler works fine but I have noticed that when I demand hot water the CH outlet pipe from the boiler also heats up considerably. If the boiler is in summer mode then the CH pump does not start and only the first 6 feet or so of the CH pipe heats up. If in winter mode (with time clock set to off) the CH pump runs and the rad nearest the boiler warms up. After the bath is run the nearest rad reaches approx 40degs C.

The diverter valve does operate - lifts and hits the micro switch to light boiler - but I am guessing that some of the heated water from the exchanger is leaking past the diverter valve and into the CH circuit? Damaged/decayed diaphram?

Please could someone with more experience than me agree/disagree with my diagnosis?

Regards

Daniel, August 2008

the valve its self is ceased i had the same problem a couple of months ago new diverter valve im affraid bout £110

cav, November 2008

I have ordered a diaphragm so will find time to replace the part at some point.
I'll post my findings.
Cheers

Daniel, September 2008

Hi, I seem to be getting almost no hot water, If the water is kept running I might just get armish water. I think it might be the Diverter Valve, could I be right

singh, September 2008

Only one way to find out Daniel.
Have a look...
Enjoy ;)

Mick, August 2008