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hot / cold water?

SIME Format Freindly 80e

Hot water runs red hot then luke warm then red hot again just keeps up/down with the temp......any Idea.
things Ive changed.
3bar pressure valve
ignition switch.
Flushed system on central heating
added inhibitor....
Lee, December 2010
hot water sensor/thermister

stuart, December 2010
turn the water pressure down to about 8ltr per min

s4ktn, December 2010
link Click here to see other fixes for Sime.