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Mend Jaguar 28KTVS F3 Fires Water Locks

jaguar 28ktvs f3??

boiler fires warms water then locks out saying f3 fault "boiler overheating " what could this be ? blocked heat excanger or diafram ?

c phillips
July 2008
JaguarJaguar 28KTVS F3D.I.Y, PlumbingFires Water Locks
First place to try would be the circulating pump. 90% of the time Overheat faults are where the boiler is not dispersing the heat quick enough. A blocked heat exchanger is a more drastic fault and highly unlikely due to the age of the boiler. There may also be a thermostat or board fault but these will need to be pinpointed and fixed by a Heating engineer.

Steve
July 2008

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Jaguar 28KTVS F3 Fault - Boiler Overheating