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Weve got a good old fashioned boiler and hot water storage tank. The boiler is a Boulton Bolderus and built like a tank. The thermostat is a salus 310rf I think. Now my limited understanding goes like this the heating and hot water are programmed to come on and off at X o'clock. Once the thermostat detects its Z ⁰c where it is it cuts out the flow to the radiators until it drops below the set temperature then opens the valve again. The thermostat does this by sending a signal to a receiver in the airing cupboard. There's a big red Grundfos pump that whizzes the hot water from the boiler round the system. Hopefully thats right. Anyway before the weekend I'd noticed it getting a bit cold and kept nudging the thermostat up when I thought but finally by Friday night it was 16 degrees upstairs and was bloody cold! Flicked the reciever across to manual mode and the boiler fired and everywhere warmed up but obviously there was no temperature control so it got roasting! Fiddled with the on and off times and tried switching back to auto mode today and were back to cold rads again. A flick back over to manual wasn't enough this time to fire the rads. I turned the hit water off for an hour or so on the control box then turned it back on now and the boiler fires up and the whole system seems to have kicked in (I think, I'm huddled under a duvet so I'm warm anyway). So I'm thinking 1 the thermostat is goosed but it's new ish, less than 6 months old, after the last one fell victim to the toddler. 2 the receiver is goosed. That is older but wouldn't be any older than 2004 at the absolute oldest and I think it's nowhere near that old. 3 the diverter valve is ********. 4 the pump is on the way out. Or a combination of a few. I have a replacement receiver it came with the new thermostat. The pump is about £50 from screwfix. But I'm just curious what the PW plumbers think.