F3 Code - Jaguar Combi

D

DAJ

I've got a constant F3 code on a 28k Jaguar Combi!

Heat exchanger absolutely clean as a whistle, pump operating fine - signs of slight weeping from the flow sensor, so I replaced that thinking it was the obvious problem! Still F3!

To the best of my knowledge, an F3 code indicates a lack of flow; ie a blockage or, at least, that is what is being detected and relayed to the main chip.

As soon as 0.8 to about 1.2 bar is reached when replenishing, F3 comes on and the pump still operates. No air in the pump - bled! The boiler makes no attempt to fire up prior to the F3 code. As soon as the pressure is up - F3!

Any ideas?

PS _ I know these boilers are none too clever and they were made by GW and/or Protherm.
 
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F3 is interpreted to mean a blocked heat exchanger.

But that can be main or secondary or a pump fault.

What does it do if CH is selected?

Tony
 
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This thread is about a gas operated furnace!

Not a Jaguar car!
 

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