Saswell T21STK-2 - Filter Timer Management

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Press the ▲ or ▼ buttons until you reach the correct day of the week.
Press the TIME button again. The display will now indicate the correct time
and day of the week.
3. Filter timer
a) When in configuration the selections are in months, each month
selections are equal to 30 days.
b) Move the SYSTEM switch to the HEAT or COOL position, then
press and hold the ▲ and ▼ buttons for 5 seconds to review filter running
days.
To exit the review menu press the ▲ or ▼ buttons one time. Or If
no buttons are pressed within 15 seconds, the thermostat will exit the
configuration menu. In review mode, press and hold the ▲ and ▼ 15 sec. to
clean the filter warning. It will show “dEF” blink. To reset the filter
days – refer to configuration item 5 operation.