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Thermostat and Programmer not communicating with Boiler

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Ravi Patel

Thermostat and Programmer not communicating with Boiler. Both have been replaced. Any ideas?

On the Glowworm boiler 18sxi I can use the CH controller to switch on/off the boiler, that works fine.

Also upstairs i have a tank, when I switch that on I get hot water. But what else can I check as the External Thermostat and Extrnal Programmer not communicating with the Boiler.
 

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