i have a saunier duval thema f23 combi boiler british gas has fit a new heat exchanger and pump we still get a loud wooshing noise through the system as it seems to overheat in the manual it says press the red reset button on the right hand side of the thermostat but i cannot seem to locate it
Thanks, that helped a lot.
Found it at the top of the pipe ( ours was on the left side ).
Now have hot water again !
Julian, London, December 2015
you have to remove large white front panel and the stat is on the right hand side of the heat exchanger on one of the copper pipes the " red button " is about the same diameter as the lead in a pencil and is in the centre of the stat which itself is only about 20 mm diameter easy to find once you've found it good luck
