If you think an instructor has been unfair it might be worth mentioning to CP or someone because there may have been other complaints. I've seen guys removed from training for being unreasonable.

Talk to your union's training committee. Did they let you retry what was missed in the sim before failure?

Good luck finding another job in the next 5 years, you will have to explain what happened at every interview.

First of all don't listen to Natca... Dunno what their problem is. One busted ride isn't a big deal. In fact I'd venture to say 70-80% of pilots have at least one busted ride (PPL, Instrument, CFI, RPC, etc).

Secondly... If what you said about the situation is what truly happened without leaving anything out or embellishing it sounds like calls to your CP and ALPA reps are in order. No one should be set up (purposely or accidentally) for failure on any checking event.

FYI, the story you wrote is not the story you want to tell @ your next interview. Too long, for starters. It also sounds like its not your fault, but rather the LCA's fault for not hearing the whole conversation, or the seat support guys fault for leaving certain items on. That may very well be the case, but you can't say that in an interview. I've quoted the parts you need to take out.
Here's your new story:

I mistakenly allowed certain de-icing items to be left on when they were not supposed to be on during an abnormal checklist. I misinterpreted a conditional statement in the checklist as "if you are using it" vs. "if it is required by conditions". I learned that checklist discipline is important. The checklist is there to enhance safety, and it is important for me to use every resource at my disposal in a situation to bring the highest level of safety to my flying. I haven't had any training issues since. . . . Or something like that.

It's my fault, this is what I learned from it, and I'm a better pilot for it. I am safe, I have good CRM, and I don't have a record of training failures. Mention the failure, take ownership of it, and then spend the majority of your answer on why you're a better pilot b/c of it. The training failure doesn't define you, it enhances your skill set.

Any pilot who's been in this industry for awhile either has a checking failure or deserved one, but was lucky enough to not get one through a benevolent evaluator or one who just didn't catch the mistake. It's not a big deal to make a mistake. It's how you handle the mistake and what you learn from it that is the key, especially in an interview.

Could't have been explained any better.

Check rides should be learning experiences not "got ya" experiences. There isn't a pilot out there that couldn't be busted if the check airman want to bust them. It sounds like your situation was BS and the check pilot was making it up as he went along.

So you were running abnormal checklist and the PM was actually PF at the time. Why would he be doing anything other than flying? You said you were doing something else. Shouldn't it have been the checklist since in fact you were now PM?

It seems there may be more to the story.

I would just lie. They don't actually check PRIA. That would cost money. I requested my NDR record and it said no company have ever requested my NDR record. It should have been checked 3 times by now. Cheap companies do cheap background checks. If it is a good non-cheap company then tell the truth.

As a Training Center Evaluator myself (part 142), it seems as though the guy giving your ride may have strayed a little from the PTS. If I stray from the PTS, it certainly would NOT be a bust, but a learning experience. I will NEVER put a guys job on the line during checkrides. I hate Check Airman that do that. We trust you guys for 6 months to a year at a time flying these jets around the country, but when you come in for a sim check all of a sudden you are not up to standards? BS! This $hit needs to stop.