help please bye passing loss of water sensor

[gasmarc]

I have just been out to an isomax F28 E that was showing an 09 fault. I have filled the system and cannot get the digital pressure gauge to move still on 0 bar, there are 3 wires going to this sensor is there anyway around this does anyone know please

 

[aggis]

Probably just some muck in the capilary tube, drain it down clear with pin/fuse wire, if it doesnt work, change it

 

[gasmarc]

Cheers Aggis I have drained the system and changed the pressure sensor and all is up and running. I have never come across these on normal boilers before where there are 3 wired and controls the digital pressure reading on the boiler , So i dont think i could bye pass it