I have a Sime 100c format combi boiler, it is 18 months old and the hot water doesnt work. The heating does and i cannot locate any leaks. The pessure is ok and i have tried turning it completely off and back on with a small hope it would help.
Can anyone help??

sean, January 2007

Its usually not the flow switch because it need the preasure difference to change the switch over its the diaphram the problem is they are not very good with the dirt in our water systems so when your boiler calls for water to heat the dirt follows and wears the diaphram they are about £25 and difficult to get at but it beats having a cold bath

Alan, February 2010

I think u will find it is the diverter valve. Had the same problem myself last year. I had the diaphram changed and it seemed to be ok for a while but having the same problems again. It may need the full valve this time, about £85 online.

Leigh, April 2007

Yea bobby rob, it is the 100 e. Whats the problem and how do i fix it?? Thanks.

sean, January 2007

do you mean a 100 e not c reply to this and i will cure your problem

bobby rob, January 2007

flow switch problem

lee, January 2007