Honeywell RTH2300 Thermostat User Manual


 
Operating Manual
16
In case of difficulty
Screen is blank. Ensure two fresh AAA alkaline batteries are correctly installed.
Temperature settings cannot be
changed.
The System switch is off.
You are setting the temperature outside its allowable range:
Heat: 40°F to 90°F (4.5°C to 32°C)
Cool: 50°F to 99°F (10°C to 37°C)
Cool On or Heat On is flashing. The compressor protection delay is underway. Wait for the delay
to end (maximum of 5 minutes).
HI appears on the screen. The ambient (measured) temperature is above 122°F (50°C).
LO appears on the screen. The ambient (measured) temperature is below 32°F (0°C).
E1 appears on the screen. The temperature sensor circuit is opened. Replace the thermostat.
E2 appears on the screen. The temperature sensor circuit is shorted. Replace the thermostat.