HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi Fred, thank you for choosing Just Answer, my name is ***** ***** I will help with your query today.
Have you tried using a car charger to charge up the 12V batteries your son installed, as it sounds like they are flat.
Secondly ask your son to check the batteries are installed the correct way round, if the chair works after charging the battery then stops working after the batteries run flat, and wont charge using the chair' on charging circuit it points to a fault with the chair itself.
If you would sooner have someone come out, if you provide me with your postcode I can recommend someone.