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Ok, I've spent time drawing out the circuit diagrams and I've answered my own question. The NEST is never going to work with an ST6400 also in parallel circuit. If, as suggested by NEST, the ST6400 is set to water continuously ON, Then that puts power on pin 3 of the programmer, which is...

Hi Ive just installed a nest v3 Thermostat to control heating and hot water on my existing system which is Potterton Suprima 100L Boiler Honey well ST6400C Programmer Honeywell v4073A mid position diverter valve The old system didn't have a main thermostat , just TRV's on every radiator. I've...