I'm stuck! Boiler wont start up.

[Michael freeman]

So, oil ran out, found out (from you guys) how to bleed it, couldnt release the pressure gauge value (kept bending Allen keys),
This point boiler firing up then locking out,
Pressed the reset button while system turned off and now with the boiler turned on the button still depressed!, all ready to bleed but button wont reset to start draining.

With system off and pressure value out no oil.

Any ideas? It's a Honeywell TF 832 and a Dane moor

Thanks,

 

[Terrywookfit]

Bleed nipple is opposite side of pump. The Hexagonal nut with a hole.