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Honeywell RTHL221 series Operating Manual page 21

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In case of difficulty
Make sure heating and cooling temperatures are set to acceptable ranges:
Temperature
settings do not
change
"Cool On" or
"Heat On" is
flashing
"Heat On" is not
displayed
"Cool On" is not
displayed
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
• Compressor protection feature is engaged. Wait 5 minutes for the system
to restart safely, without damage to the compressor (see page 15).
• Set the System switch to Heat, and set the temperature level above the
current room temperature (see page 7).
• Set the System switch to Cool, and set the temperature level below the
current room temperature (see page 7).
19
RTHL2310/RTHL221
69-2577ES—01

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Rthl2310 seriesRthl2310bRct8103 series