n00b - short IR sequence learning...?

I've build a little program from the api example as guideline and used very happily until my parents decided to change the air-conditioner. I would like to learn and record the air-con IR remote’s sequence from UIRT, but the sequence is too short it stop at 24% while learning. Since the fn_learnIR is from the dll, what can I do to learn it?
Than you so much for your help
Alan
Than you so much for your help
Alan