Problems with heating and hot water

[thejhd]

Hi all, I have a problem with my heating and assume it's due to my crappy isar he24 boiler.
Have had a few problems with this over the last two years and it has began again. What it is I turned my heating back on Thursday night at the thermostat, only to 21c now the rads won't turn off even when the thermostat is off. I've turned the setting on the boiler down but still getting hot.
What also has started to happen this morning is that the pressure gauge has dropped to 0 and I have no hot water, and when I turn the hot water tap on the gauge has started to flucuate but never higher than one. The display codes on the boiler don't indicate any faults but this has happened before, last time I solved it by turning the boiler off and back on again.
I need to get this fixed but at the moment can't afford to get anyone out to do this so wondering if there is anything I can do myself, like how to increase the pressure etc..
Thank you

 

[kevplumb]

look for the filling loop

View media item 11214
open the taps to increase the pressure

 

[thejhd]

Had a look for the loop and can't seem to find it, certainly can't see any taps to open. taken off the front panel as well

 

[kevplumb]

its not in the boiler it should be on the pipework near the boiler