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Heating, Home Heating Systems (31117 other questions)
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i have a Ferroli combi boiler i have 1/2 the radiators working and 1/2 not ?

i have a Ferroli combi boiler i have 1/2 the radiators working and 1/2 not they have all been bleed but not working now i had a a3 code and the problem has started after that



joe
February 2020


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its a ferroli optimax plus he31c

joe
February 2020

You've not told us the exact model number of your boiler, but an educated guess and a quick search found this information on an A03 fault code:

"High limit protection – flow temperature sensor not active, incorrectly located or no system circulation. Check the position of the flow sensor or check pump and radiator valves"

With that advice from the manufacturer, I'd first look at the circulation pump if you have bled the radiators.

As I say, this information may not be relevant to your specific model, but in general, a Ferroli A03 code on most of their boilers points to a fault along the lines as that quoted above.

Rupert
February 2020

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