18
Power failure Indicator
The programmable thermostats with battery backup also will
indicate a main power failure when the 24 VAC power from the
room air conditioner is not present.
Power failure
The thermostat will display a power failure
indication (“
PF
”) on the screen.
Note:
If “
PF
” is displayed, it means the 24
VAC power to the thermostat is lost.