I'm in the USA. House was built in 1956. Single pole switch upgraded from 15 amp to 20 amp. The switch has both a white and black wire with no ground.
When I tried connecting the fan/light combo to the existing wires in the attic both the fan/light combo as well as the vanity light would either flicker or was dim even with the switch off. These are led lights. The exhaust fan company told me I couldn't wire them together because they thought my fan had Bluetooth. When I corrected them and told them it was a standard fan THEN they said "Oh yeah our fans can't be wired into any other lights." I find that to be a junk answer. Homewerks brand fan. Any ideas?