Vailliant ecotec624 system boiler

[Danv44444]

I have a fault code f75 on the above boiler. I need to check the water pressure sensor. does anybody know what the resistances should be? cheers guys.

 

[tom609]

changed a few of those recently

 

[Danv44444]

How old are he ones you've been changing? The boilers not firing up first thing in the morning very well. After its been running a while it works fine.

 

[tom609]

about 3-4 year old boilers i dont pig about with them just swap them over usually sorts it

 

[vern]

about 3-4 year old boilers i dont pig about with them just swap them over usually sorts it

Don't bother get the F75 kit from vaillant it basically relocates the switch to stop this problem, port can be partially blocked too, clean to get going.....

 

[Danv44444]

We're the boilers u changed them on having similar problems to the one I've got?

how much are they?

 

[kozak1968]

On the older ones. Debris collected in the tube so they relocated the sensor higher up

 

[Danv44444]

Thanks Kozak. Are they expensive?

 

[GrahamM]

As mentioned. Also have changed a handful of the sensors on boilers no more than a few years old after getting F75.
Waste of time trying to clean as you will be back.
About £25 a go IIRC.
Been recommending fitting filter as well.

 

[kozak1968]

As graham M quotes

 

[Danv44444]

Thanks graham. The boiler is only three years old. When I first got the call I thought it must have been the room stat, programmer or 2 port because by the time I got there the boiler was working fine but not coming on first thing in the morning. Then the next time I went back the customer had noted the f75 fault code. There just leaving the boiler on constant for now and I'm gonna go back in the new year and fit a sensor.

 

[kozak1968]

When the sediment settles to the bottom and the pump has stopped, then in the morning the pump starts, this is when the sensor blocks.