I bought a new Nest thermostat which is supposed to be compatible but needs a professional installation (advice that should have been heeded by non-professional electrician me). This is to replace an old finicky thermostat that must be original with this 20 year old house. After wiring up the Nest and starting to go through the menus, I realized it was better to let a pro do it. So I put everything back the way it was with the old thermostat.
... Or did I... With the old thermostat back on, the heat keeps going up and up without being able to be switched off or lowered by the thermostat. I can get the HVAC to turn off by removing the front face of the old thermostat (like in the pictures below) but that's all the control I have.
Here's the wiring before I attempted any changes:
And here it is after I tried to get it back on:
I've scheduled a pro to come out and install the new thermostat this coming Monday... But that's a while to wait now not being able to control the heat. Plus I'd rather have the old setup working before he gets the new one put in. So... HELP!
Additional information - maybe not relevant:
I did have the breaker to the house completely turned off while switching out thermostats. The first time I put the old one back on, the display went nuts flipping through numbers. So I took it right off, flipped the power to the house back off... Double checked the wiring and how well screwed in it all was... Then put it back on and powered back up. After that, the display is completely normal, but the HVAC ignores the settings still. The thermostat even makes the same "click" that it would if I changed the temperature above or below the current temperature, but nothing changes still.