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But if the valve actuator had failed, would that prevent the boiler from firing up? If I put the HW valve into manual, that doesn't cause the boiler to fire up - I still have to turn on the HW at the controls to get the boiler to fire up. If I put the CH valve into manual, the CH controls do...

Thanks for pointing me towards the lever. It's starting to look like the problem is with the control panel (as if the thermostat is set to cold or is broken). I've moved the CH zone valve lever to manual and when the HW comes on, the radiators warm up - so I know the valve itself is not...

Here's a diagram of everything I found. Even if that wall thermostat has power, I don't see where it would connect to any of this to control the valve.

It does click, does that mean it has power? I have no idea where that wire goes

That thermostat is just for the hot water - it's set to 49 degrees and has a thermometer attached to the tank. I guess as the RX1 only receives 1 signal, and this is the only receiver plugged into the heating controls, that I don't have a CH thermostat. There's a really old looking one in...

Thanks. Obviously I'll turn the power off at the breaker before I look around here but how should I go about troubleshooting this? 1. is there an easy way to tell which one is the CH and which is the HW? 2. Are there likely to be fuses in that white box or is it just to hide the cable being...

In the picture, that Danfoss RX1 receiver is connected to a hot water thermostat in the tank that should just control the HW temperature (that's powered on and working). I'm not aware of a CH thermostat. There aren't many valves around the hot water cylinder; there are more valves near the...

If I turn on the hot water, the boiler starts up first time and works fine, but it is completely unresponsive to me turning on the central heating. It doesn't make any sounds, no flashing lights (just power on, and flame off like it's still on standby). Is there anything obvious I should...