This will display ‘EH’ in the cool setpoint and lock out all modes except the OFF and HEAT modes. What does EH mean on venstar thermostat? Symptom #1: Most of our heat pump compatible thermostats will allow Emergency Heat to be activated by pressing the FAN and the UP buttons. Press the UP and DOWN arrow buttons while you hold the MODE button. How do you unlock a venstar t2900? Press and hold the MODE button to lock or unlocked the thermostat buttons. How do I unlock my venstar thermostat? Press and hold the MODE button to lock or unlocked the thermostat buttons. How do I unlock my venstar t1800 thermostat?
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