Filling/pressure issue - Bosch Worcester CDI 28?

[Ecob]

I have just seen that the pressure gauge is down at 0 and have attempted to fill it up in the correct recommended manner, three times. When the grey knob is turned you hear the water flow for about 3 seconds then silence with no movement in the pressure gauge.

The boiler has been running on constant 24 hrs a day at 16 degrees c since October. It still is firing and heat is still coming from the rads, but no movement on the pressure gauge even if I increase the temp for five minutes.

Is there a filling fault?
&/or
Does the pressure gauge need replacing?

Any other suggestions?

 

[bobthebender]

Is there not a key as well as the grey knob with that model ?

 

[Ecob]

Cheers for a quick response.

Yes its is the old large white key model that has to be in place first.

 

[craig51]

from memory this boiler has two knobs next to the white key, one a grey white one, and one a black one. Is it not the balck one you turn once you have engaged the key?

 

[nickso]

nope, black knob does nowt.

gauge or the tube to it is likely to be faulty if the boiler runs ok.

 

[craig51]

nope, black knob does nowt.

gauge or the tube to it is likely to be faulty if the boiler runs ok.

Out of interest, what is the black one for??

 

[nickso]

nope, black knob does nowt.

gauge or the tube to it is likely to be faulty if the boiler runs ok.

Out of interest, what is the black one for??

no idea, never seems to do anything and i haven't felt the need to investigate further.

 

[bengasman]

Time to get a RGI in.