MY MAIN BOILER FAULT LIGHT HAS STARTED FLASHING, AFTER RESETTING I NOTICE IT THAT WHEN THE HEATING WAS ON AND THE HOT TAP WAS OPENED THE HEATING PRESSURE JUMPS UP BAR 0.5 BAR AND THE FAULT LIGHT FLASHES .WHEN THE TAP IS CLOSED THE PRESSURE DROPS BACK TO NORMAL. CAN ANYBODY THROW ANY LIGHT ON THIS ?
