If I turn the heating on at the controller, it does not activate. Here is what I have to do:
1. Make sure the Hot Water is On - it must be on for following steps to work.
2. Turn the Heating on (at this point it will not work).
3. Turn the Hot Water Off - now the heating comes on.
I can now turn the Hot Water back on at this point and both the water and the heating continue to work.
During this process, the manual thermostat does not click when I turn it until Step 3 of turning the hot water off. At that point, the thermostat clicks and the 3-way valve moves to the heating setting. When I turn the hot water back on, the 3-way valve moves to the middle setting and both work.
