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Hi everyone i have a potterton puma 80 the hot water works fine but the central heating wont work from the external timer. if you switch to constant it works ok, but is on all the time. i have changed the timer (new) and even changed the main circuit board. i also checked the switch which is...

i have a ideal isar he24 condensing combi boiler with a heating fault. the hot water is fine- no problems. but when the heating is due to come on the 'c' appears in the window but the light just flashes, there are no fault codes and the water pressure is set to 1 bar as stated in the book...