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Mastervolt 2000w combi charger/inverter Mains input is not going anywhere, will not charge the batteries. Mains up to the connections underneath OK. Inverter works fine apart from showing led fault code for overheating even from stone cold switch on. Its not any connections, resetable thermal fuse, or duff batteries. No signs of a burn up. Any ideas please?

Mastervolt 12/2500-100 Mass Combi Inverter Charger So, we're onboard, on the shore electrical supply, all boat 240v circuits working fine, charger whirring away doing its thing very happily. Along comes electrical test man safety testing shore supplies, off goes the shore power, he the tests the shoreside installation and RCD so power trips a couple of times, all done, power restored. Didn't realise quick enough to disconnect my boat before he started, but had we not been aboard then I wouldn't have had the opportunity anyway. The issue was noticed immediately on restoration of the power and, whilst the electrician was quick to explain it was nothing to do with his testing, the coincidence is rather too glaring. Not necessarily his work, perhaps a power spike on restoration? Anyway, he beat a hasty retreat. So, I now have AC input to the boat again, but all is silent. Investigation reveals 240V at input terminals to Combi, 240V on AC output "power" terminals (shore supply only - immersion heater cct in my case), 240V not present at AC output "short break" terminals (so no shore power to sockets, etc). AC input led on Mastervolt front cover is 'off', battery charger not running. The thermal fuse has not popped open, hence doesn't reset. Switching the inverter on works as it should, supplying 240v to sockets, etc, from the boat's 12v bank. From these symptoms I believe can ascertain that no shore supply is reaching the short break circuit (from which the charger is also supplied) - I suspect that the transfer relay is not closing. I have the User Manual and it's helped so far, but I've run out of technical information now. Can anyone provide further enlightenment or does anyone know 'a man who can'? The situation is made rather more difficult as the boat comes out of the water tomorrow for blacking (self employed and we're staying aboard), so I can't run the engine to keep the batteries topped up if I use the inverter. I'm considering a temporary connection of the unaffected AC output power to the cable leaving the short break terminals to give me domestic 240V whilst the boat is on the blocks, so if anyone sees reason not to do that, do shout! I'm still in head scratching mode at the moment, I and wanted to get a thread started in case you guys are able to provide ideas and info. Help, advice, or appropriate phone numbers, much appreciated. The boat will be on the hard in Droitwich Spa Marina from Friday. Thanks in advance.