Simultaneously press the Up Arrow and Fan buttons together (increase temperature). Check for 24 vacs at Y/Y2 terminal. If present, the thermostat is OK and the problem is with equipment or wiring. If not present, replace the thermostat.
I have a Totaline P274-1200 Gold series programmable thermostat ... Troubleshooting Gold Stats ...
Hi, My totaline thermostat says EH on it and will only heat. .... registered with NETWORKING HUBS and SWITCHES PROBLEMS in computers.
Troubleshooting Broken Thermostats The main connection between the air ... The HP with Totaline thermostats typically means it is in Heat Pump mode.