Starting APU

[LuseKofte]

Well this chopper never been my favorite and it took me a while too learn the system in backseat. And occasionally I return to it in order to keep up a minimum of operational capacity on it. This involves cold start every time. After many hours flying the Kiowa I went back to it and found out it took me several clicks to get the APU to start. 
Next time I could not start it at all. 
Have I missed something? I read the manual but couldn’t find a different procedure than I do

Can this have been sort of ruined by a slow repair I recently did?

[Raptor9]

All that is needed is to turn on the battery by setting the MSTR IGN knob to BATT and then press the APU button. This procedure has not changed since the module initially released.

If you think you are experiencing a bug, please remove all mods and post a short track of what you are experiencing.

[petsild]

The APU start-up is a few seconds longer.

[LuseKofte]

1 hour ago, Raptor9 said:

All that is needed is to turn on the battery by setting the MSTR IGN knob to BATT and then press the APU button. This procedure has not changed since the module initially released.

If you think you are experiencing a bug, please remove all mods and post a short track of what you are experiencing.

I just know that APU is not willing. I see the button animation work. But thanks for the tip. 
I have installed OH 6 and Blackhawk since last time. It is probably it. 

[LuseKofte]

Mission have 6 choppers starting up at the same time 

I did not hear it start spinning. And it take a while to get the green light. So I probably switched it off again