Dead Potterton Powermax HE

[gastec]

Hello
Ive got a problem with a Potterton Powermax HE. The display on the boiler was totally dead, checked internal fuses they were fine so i replaced pcb, turned the boiler on and the green display lit up with nothing on it and nothing in the red display. Am i right in thinking i might need to also replace the Huba sensor and need to get hold of a wiring adapter for it to work or is it a faulty pcb.
Please help thanks

 

[aggis]

1. Switch electricity supply on at the isolating switch
and switch the boiler on (‘I’ position on On/Off
switch).
2. Move the boiler on-off switch to the ‘I’ (on) position.
Note that displays are visible in both windows of the
control panel.
3.Press the DHW select button to switch hot water on
(green neon stays on).
4. Press reset button to scroll through LH window until
display shows “p 1.5” to check that system pressure
is between 0.9 to 2.5 bar. Adjust as necessary. The
fan starts to rotate after a slight delay and a few
seconds later the automatic ignition sequence will
be initiated. The green burner neon will indicate when
the burner lights.

Hi
If you've done as above I'd ring Baxi 08448711555, as if it was the Huba/pressure sensor it should show A15