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Potterton Profile 80E Boiler?

The system is fitted with a Honeywell ST6400 programmer.The boiler and the programmer are no longer communicating.I have fitted a new programmer but the problem remains.The boiler can be turned off/on using the thermostat controle on the boiler, and the boiler ignites and both the CH and HW are as they should be.
Graham Hulse, February 2009
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