Home Technical Questions

No heating demand

Just had my boiler serviced, and since then the Tado system is not demanding any central heating.
I have an extension kit, smart thermostat and several smart radiator thermostats.
Light on extension kit is pulsing.
Tried re-pairing the extension kit.
Tried switching extension kit, and Internet bridge off and on again.
App shows everything is connected.
Has been working fine for a year before now.
Any suggestions please?
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