Vailaint eco tech plus 4 bar pressure

[Super Mario]

I've got 4 bar on the digital display but when I've let some pressure out f75 kicks in low water sensor this is at 3 bar anyone know why this is maybe need a new sensor?

 

[AllyBongo]

Public forum

 

[Dotty]

Moved.

 

[billybob150811]

prv lifts below 3 bar so looks like display problem has it got the pressure gauge inside low on the right

 

[AllyBongo]

Sounds like it will probably be the pressure sensor. F75 is when the boiler hasn't picked up a pressure rise when the pump kicks in. Check the manual gauge. I would totally drain the boiler, then if you're still getting a pressure reading on the digital gauge, change the sensor. Also check the boilers not sludged up...