Does anyone know what f25 means on a vaillant ecomax boiler?
I first noticed that there was no pressure so turned the red knob underneath the boiler and the pressure dropped even further - oops! Now the fault is saying f25 please help!
f25 error code means that there is an interruption in the thermal module cable harness. This is probably due to the fact that the cable harness is defective. I think you'll need to replace it? It is not water pressure.
On some V boilers the water top up is by way of a hidden valve accessed from beneath the boiler without removing any casing/grille. There is a special key for this, failing which a flat head screwdriver will do the job. Turn a bit, hear the water flow and watch the water pressure rise, then turn it back.
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