I have a forestry tree farm running on charcoal from the EnderIO alloy furnace, it took a while to get there and get the required materials together but was worth it in the long run.
I played around with one of those GT boiler, the bronze one, and it seemed pretty buggy to me, stopped accepting charcoal after using 1 (out of a stack of 64) yet there were no issues on the maintenance hatch. Also I had the steam going straight into a steam turbine and even though the turbine was full and connected to an empty battery box thingy with empty batteries in they would not charge.
For that reason I started to use railcraft boilers. Maybe I was doing something wrong if they are working for other people?
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Where did you put the steam exhaust vent ? It can't be on the bottom layer - it has to be part of the main boiler.
Also, did you duct tape the maintenance hatch ? I believe they may be buggy (still). Duct tape seems the only way to keep it 'maintained'.
Also, what does the controller block say and have you right-clicked it with a rubber hammer ? When you do, does it turn green ?
If none of the above help, provide pics, please.