It's probable that the elements are OK and there are no thermal trips as such, just the relays, so it is likely a relay is failing when attempting to switch both elements into circuit for full power. Graham Cutmore suggests it is one of the relays on the main PCB that is failing - since it works on 1kW and 2kW mode but not on 3kW - and 3 kW is obtained by switching both 1 and 2kW elements into circuit. Looks like you may be spot-on on several counts. He has no problem with this and even posted the parts BEFORE my cheque reached him. I have dealt with Graham for parts and repaired the boiler myself. The parts for these boilers are not cheap so I would take the van to an expert for a straight fix (as opposed to buying various bits until you hit on the right one). He will know if this is possible or not by asking the right questions. If you contact Graham Cutmore, he is a genuinely nice chap and might offer a pointer or two so you can fix it yourself. I would guess that you have a fault on the Printed Circuit Board which is causing this (and under the circumstances, it is only a guess). I am not psychic but there is a bit of the Hercule Poirot in my make up (plus nearly 50 years of engineering knowhow).
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