Source 1 S1-THEH21NS - Temperature Unit Selection; Convert to Celsius; Convert to Fahrenheit

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Fahrenheit or Celsius
MODE SWITCH
Cool, Off or Heat
Operation
Select Off with the Mode Switch.
Press and hold the COOLER and WARMER
buttons at the same time until the temperature
is displayed in degrees Celsius.
Repeat this process to display the temperature
in degrees Fahrenheit.
OWNER'S MANUAL
S1-THEH21NS
COOLER & WARMER
BUTTONS