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My boiler is giving an intermittent L/F code. This is to do with ignition, right? So the plumber came round, had a look and said the boiler is knackered because of "shedding" in the main heat exchanger. He said this would cause overheating, which would cause the boiler to lock out. The only...

Here is what I have tried : Clean secondary heat exchanger (twice) Replace overheat thermistor. Replace PCB. Bleed pump. Still the DHW oscillating between hot and cold. No errors on the panel. What else could I have missed? A new boiler will be an option in the new year but I just need...