In case of difficulty
Screen is blank.
Temperature settings cannot
be changed.
Cool On or Heat On is
flashing.
HI appears on the screen.
LO appears on the screen.
E1 appears on the screen.
E2 appears on the screen.
• Ensure two fresh AAA alkaline batteries are correctly installed.
• 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)
• The compressor protection delay is underway. Wait for the delay to end
(maximum of 5 minutes).
• The ambient (measured) temperature is above 122°F (50°C).
• The ambient (measured) temperature is below 32°F (0°C).
• The temperature sensor circuit is opened. Replace the thermostat.
• The temperature sensor circuit is shorted. Replace the thermostat.
15
GTP110D / GTP211D
69-2425EFS—03