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sime super 90
hi can any one help i've got a sime super 90 that keeps building the pressure up to over three bar and then dumps it out through prv valve. i have changed the ball valves both sides of the filling loop, the other thing i think it might be is the heat exchanger . anybody got any idea please
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if the pressure is rising while the heating is on then its a problem with the expansion vessel, it either needs re-pressurising or possibly replacing it it has failed completely.
if the pressure is rising overnight when the boiler is not running then it is a prob with the heat exhanger, either the main exchanger or the secondary hot water exchanger depending on what system your boiler uses.
if the pressure is rising overnight when the boiler is not running then it is a prob with the heat exhanger, either the main exchanger or the secondary hot water exchanger depending on what system your boiler uses.
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