Apple Watch 5 won’t charge or turn on
When put on the charger, the green charging indicator comes on for a few seconds and then goes off. The watch immediately gets hot. It does not charge and force restart does not work. Other options?
If it gets really hot, then it might indeed be a hardware problem. I would contact Apple Support. Also, for service & repair.
watch Repair - Official Apple Support
watch Service Pricing - Apple Support