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Mend Baxi Duo-tec Switch Boiler Switching

I keep getting D4 popping up, whenever I switch off the boiler heater?

What does d4 mean, after switching off the heater?

arshad
January 2011

Baxi Baxi Baxi Duo-tec Heating, Home Heating Systems Switch Boiler Switching

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Baxi Duo-tec D4 Error - Meaning & Fix