After turning off the main switch to change some lamps, the heaters in 2 bathrooms stop working. Both main switch and secondary switch are in the on position. Seems a simple problem but not sure what it is. The bathroom heaters switch (in the fuse box) is not tripped and keeps on the on position without any problem.
Sounds like you have made a new ring circuit which returns back before reaching non working ones. Can have a look for you