I lusted after underfloor heating for years. If I'd done it just 5 years ago my system would have been incompatible with 2023 current standards and very disruptive to install. I then discovered large 2-2 radiators can be sited unobtrusively and perform brilliantly!
Got it now the fire line is yellow thought it was an earth.
Terminal L has to be jump connected to terminal 1 with an additional short cable.
Yellow fire line has to be moved from terminal 4 to terminal 3.
But 240V so make sure you feel competent to do it.
Is your boiler fitted with an optional controller with time settings, and these are the settings you use to control times?
If so your old controller was doing nothing.
The feed to your boiler is connected straight onto the power supply, your old programmer was doing nothing and the boiler was permanently powered up. It sounds like the new programmer is working fine but has no conductor to the boiler to fire it up.
The back box needs a wiring modification so...
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