I changed a TRV yesterday, added some Fernox inhibitor and f4 leak sealer. System worked for a while and has now shown the F2 code. Any ideas please?
Engineer coming out later
Engineer coming out later
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Viessman F2 fault after TRV change
- Thread starter lancs_lad
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Coincidence probably.
Wait for the engineer to come in, it's something to do with the gas valve.
Wait for the engineer to come in, it's something to do with the gas valve.
PRV changed when F1 fault started. Supposedly fixed air blockage to fix the F2 but it came back again over the weekend. Came back out yesterday and supposedly cleared more air blockage. Left and F2 reappeared. I've reset system this morning but turned it off when temp showing 110 degrees and kettling. Any suggestions?
Is that boiler a system boiler with a internal circulation pump or a heat only boiler with a external pump? and is it a sealed system or a a gravity system with a small feed and expansion cistern in the attic?.
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