It happens every year, I get calls from people who have too much heat in their home or in just one part of their home.
The simple answers are:
1 A bad zone valve that will not close all the way.
2 A defective flow valve that is letting water pass.
3 A bad thermostat.
4 A bad heat anticipator on the thermostat.
5 A bad wire or cross connection.
6 Someone is turning the heat up when you are not looking.
To find out why you have too much heat, please use my 24/7 Help Line. We can solve it together.