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Mend Isar HE35 Boiler Heating Fault

How can I fix a flashing "l e" fault on my isar he35 boiler?

I worked on the radiator system over the summer and when the time came for central heating the boiler tripper out displaying "LE". The book says replace pcb (£130). I suspected air lock and found the auto vent blocked. Sorted this and system ran for 2 days when fault reoccured. Any ideas.

chubmaster
November 2009
IsarIsar HE35Heating, Home Heating SystemsBoiler Heating Fault

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Isar HE35 Boiler: LE Fault - Fixes & Advice