Power Failure Indicator - GE RAK149P2 Owner's Manual & Installation Instructions

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.
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49-5000517 Rev. 2