My children and I recently assembled the 42030 RC VOLVO L350F Wheel Loader (aside: with the 1,600 pieces and time investment, this set will likely survive to the heat death of the universe intact because nobody wants to take a day or two to reassemble it into something else).
As soon as we took it out of the box we knew it likely had a problem because none of the motors worked when we plugged them together and put batteries in the battery pack and remote controls. We built it anyway (that sucker took around 7 hours to build between the two of us that stayed awake), knowing that if a part is defective we could probably cross-ship a replacement from LEGO.
Now that it is assembled, it still does not work. We have double-checked everything according to the instructions. When we use the remote, nothing happens on the assembled set. Asking the Internet brings up plenty of positive reviews, but nothing about problems with this set.
How do we troubleshoot which part is defective, or if there is an error on our part? Ideally, such advice would be applicable to any set that has motors, battery packs, and remote controls.
What we have verified so far:
- The battery pack lights up when we turn it on. The motors beep and spin for a brief moment, indicating they are receiving power through the receivers.
- Unplugged and replugged everything.
- I tested both remotes and the battery pack with a multimeter, verifying correct voltage and amperage across the two contacts on the end. The batteries are not the problem: these are brand-new batteries that expire in eight years, and they output nominal volts and amps.
- We tried different communication channels between the remotes and receivers.
I have not been able to verify function without the battery pack or receivers because I am not sure how much current to apply to an individual motor, nor do I wish to experiment and make the situation worse.
What else can I try before I contact LEGO and spend a week or more waiting for replacement parts?