Heatline solaris fault?

Heatline Solaris 30PC shows F0 fault

I have replaced EV and PRV and pressure sensor with new parts from a spare unused boiler of the same model.

I have disconnected the fill loop, EV charged to 0.5 bar before fitting.


System pressurised to 1.1 bar and found to be working but only a few hours later pressure had dropped again.

Only thing I haven't changed is the PCB.

Don't know what to do now and engineers don't like working on Heatline boilers, can't say I blame them.

Which is the best combi to have installed instead?

Heatline hater
December 2014