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Mend Horstmann Home Heating Systems

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Mend Horstmann Displaying Time Boiler

horstmann channel plus xl h37 displaying "?" Beside time?

Hi my horstmann channel plus xl h37 boiler control is displaying a "?" Beside the time when I put it on, does anyone know what this means or what it is doin when I hit the heating on

Dave
November 2016
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Mend Heating, Home Heating Systems
Free repair help for Horstmann home heating systems