Low water pressure switch

[Jackreach]

Hi all
My low water pressure switch has failed.
I have removed it and gave it a good clean.
I can manually move the sensor and get a positive reading across the terminals.
My question is, does the system water enter the switch, as I removed it there was gunk in it but I managed to charge the system without it on. Or is the body that it fits on to gunned up as well not allowing water to the switch. I've by passed the switch temporarily to complete the firing sequence.
It's an old ravenheat that needs scrapping but I would like to know your thoughts.
Thanks

 

[ianmcd]

If you can refill the system with the switch removed then the manifold is blocked, but you are messing around with a safety device and you shouldnt be

 

[Jackreach]

Ianmcd,
Ok I only recharged the system to isolate the fault. I shall remove pump and manifold and clean it out or replace.
Plus replace old switch.
Thank you for your advice,
J.

 

[ianmcd]

Ianmcd,
Ok I only recharged the system to isolate the fault. I shall remove pump and manifold and clean it out or replace.
Plus replace old switch.
Thank you for your advice,
J.

No need to do all that , drain the boiler and where you removed the switch from , poke a small screwdriver in the hole and get the crud broken up , then place a bowl under the hole and slowly open the filling loop till the water runs clear with no crud , then refit the switch

 

[Jackreach]

Ok I will try that, I was unsure if there was a diaphragm in the body, I've just finished 4 night shifts so I'm just having a late Xmas beer. I'll update you tomorrow.
Thanks again much appreciated.
J

 

[Jackreach]

No need to do all that , drain the boiler and where you removed the switch from , poke a small screwdriver in the hole and get the crud broken up , then place a bowl under the hole and slowly open the filling loop till the water runs clear with no crud , then refit the switch

All done, was really crusted up.
Just got to get the sentinel cleaner and flush system.
Thanks again