1.    Unplug the meter from the outlet.

2.    Complete this step at the junction box located at the outside unit.  Detach the inside unit form the
       outside unit by disconnecting the black, white, and green wires.  A flat head screwdriver is needed
       to remove the cover from the junction box.

3.    Leave all three wires disconnected.

4.    Plug the meter back into the outlet.

5.    For the best results the test should be run for 24 hours.  If your meter begins to add any
       counts to the 'heat only' counter, refer to the test result indications below.

•      The correct results for the F-90 is no counts.

•     The correct results for the F-90H is six counts in 24 hours on only the 'heat & hot water' counter.  Approximately one count every four hours.  The test may produce one count less or one count more that six depending on how close the meter was to adding a count when the test was started.

•     Example]    If the test is run for 28 hours, the meter should accumulate 6-8 degree days.

•     If your F-90 or F-90H produces the correct test results, the outside unit will need to be sent to our service center for recalibration.  Click HERE for shipping instructions.

•     If your F-90 accumulates any degree days, click HERE for instructions on how to check the cable and connections.

•     If your F-90H produces any degree days on the 'heat only' counter, click HERE for instructions on how to check the cable and connections.