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New control unit in place and all working properly now. Thanks again for the advice.

Thanks guys. I've pulled the panel off and at the very least there's a blown resistor. It's definitely a ST699 and the local Screwfix have them in stock so I think I'll just pop down and get a new one before the missus gets home.

Hi, I have a system with Honeywell heating controls and a Sunvic thermostat. Not sure what model the controls are but look like an older version of the ST699. The thermostat had been wired in reverse so decided to fix it today. The wiring diagram I found suggested swapping 1 and 2 wires on...