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Touch wood :) the boiler has worked okay since my last post. But today we noticed that for a split second after switching off the hot water and the boiler restarting for the heating an error E34 appeared. It cleared immediately. Reading the messages about E34 there seems to be a similarity with...

I have read all the previous comments on Ariston A77 faults but mine is different. About 4 months ago the boiler failed A77. Reset cleared it. After about 2 weeks it failed again but Reset didn't clear it. Engineer eventually replaced the sensor and board. All okay for a week or two. Boiler now...