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It is likely that Phil has an old school Shimano Eagle rear derailleur.
I recently had a very similar issue with a Suntour friction shifter and derailleur. I tried replacing the shift cable and housing with no luck. Then I was told to replace the chain. Made no difference.
Then I took a closer look at my bike's shifter. I took my old one apart and the gear teeth that were supposed to keep the shifter from moving were worn down.
which chain is falling off. the one from the motor? if so check to make sure the sproket (ps i cant spell) and gear fom motor is lined up. on mine i remember having to flip the rear sproket. are you using the chain tenchiner pulley? i think the one that comes with the kit dosnt have a deep enough gruve. i got rid of it all together, and just made the chain fit with like 1.5 to 3 inches of play. ive seen people use the tenchiner from the rear shifting gear on a mountain bike. thats what i suggest. if its the chain from your pedals thats falling of the the guys from the bike shop are messing with you or the alined the wrong chain. or maybe you need to resize the chian they just got the wheel straight.
Being a mechanical problem that we can't see you will need to define it better to us or yourself.
I'm sure if you looked at it closer you would see that the pedal itself is supposed to spin freely while it turns on the crank which turns the chainring which transfers motion through the chain to the gear(s) on the right side of the rear wheel which drive the wheel forward.
Now, where do you think the breakdown really is?
Any search engine would then offer definitions and solutions to a well-crafted query like "bicycle chain slipping" or "bicycle gear slipping".
This should help you:http://sheldonbrown.com/gearing/index.html. Also try here:http://www.parktool.com/repair/byregion.asp?catid=4 Hope these sites help. Good explanations and pictures.
You may have a locked up wheel bearing or you may have an object stuck in the chain. Can you spin rear wheel by hand? If not, most like bearings, if so, then you may have bent gear tooth or something stuck in chain. Check derailer to make sure it is not bent
I think I can help. Place one end of the chain over the rear gear (doesn't matter which one, the biggest) and adjust the lever or twist ring on the handlebar so the derailleur lines up in a straight line with it. Pull the chain from the rear sprocket down and over the pivot wheel and back over the bottom wheel so it looks just like this S and the end comes forward. Join the chain links. Place the chain over a couple front teeth and turn the pedal carefully until the chain seats on the front sprocket.
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