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plumbing?

i have a sime super 90 combi. when i turn on
the hot water tap, the unit does not fire up,
however the ch works fine.
what can be wrong?
STEWART, June 2011
dirt in flow switch.

lal, June 2011
Most likly a faulty domestic hot water flow switch. If you have the book for the boiler you should be able to locate & replace this item.

Grandadgarth, June 2011
link Click here to see other fixes for Sime.