Now that the boiler engineer has been, I am left with the knowledge that a valve has leaked, dripping water into the pump, which is shorting. He has dried the pump, but even so, it seems I need a new pump and new valves. Even then there could be microprocessor problems, though apparently these are unlikely.
Either way the parts will arrive Friday so it will be Monday before they can come and fit them, which means another half day off placement. Monday teaching is officially at 1.30, so I would hope to make it in for that.
Now just deciding whether to go in this afternoon and find my FY1, or whether to stay home and finish off my case write up, boil water for a shave and shower and just head in for 9 tomorrow morning.
Head says the latter, heart just doesn't know.