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home Fix label Heating label_important Home Heating Systems category Potterton

Why is my Potterton Pet 1 thermostat display saying "FF"?

I have a Potterton Pet 1 thermostat for my underfloor heating and the display currently reads "FF" and I am unable to update any of the settings. Can anyone tell me what "FF" stands for and what it means?
Rebecca, December 2009
home Fix label Heating label_important Home Heating Systems category Potterton
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