Disconnect outdoor

Disconnect outdoor fan by removing the purple lead from
"DF2" on defrost control.
E. Restart unit and allow frost to accumulate.
F. After a few minutes of operation, the defrost thermostat
should close. To verify this, check for 24 volts between
"DFT" and "C" on board. If the temperature at the
thermostat is less than 28°F and the thermostat is open,
replace the thermostat as it is defective.
G. When the defrost thermostat has closed, short the "test"
pins on the board until the reversing valve shifts,
indicating defrost. This could take up to 21 seconds
depending on what timing period the board is set on.
After defrost initiation, the short must instantly be removed
or the defrost period will only last 2.3 seconds.
H. After the defrost has terminated, check the defrost
thermostat for 24 volts between "DFT" and "C". The
reading should indicate 0 volts (open sensor).
I. Shut off power to unit.
J. Replace outdoor fan motor lead and turn on power