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EPH A27-HW with Honeywell T6360B Thermostat

Hi
I have a EPH A27-HW with Honeywell T6360B room Thermostat controlling a Vokera boiler.
The T6360B is wired with two wires to N/O contact pins 1 & 3.
After reading the instructions I thought it would be a simple to replace the T6360B stat for the tado wired smart stat.
Then set the EPH to on permanently and control the central heating with the tado app.
But it doesn't fire the boiler.....
Is there anything that sound suspect in my thinking?