Product review (5 stars): Good upgrade to eliminate defrost changeover noise on older Goodman heat pumps.
I used this to replace the PCBDM101S defrost board that came on my 13 SEER Goodman heat pump (R22 refrigerant).  Like most R22 systems, the old defrost board simply reversed the compressor whenever defrost was initiated.  That caused loud compressor noise during the changeover because the pressures had not had a chance to equalize.  Newer Goodman heat pumps, with R410A refrigerant, use this PCBDM133S board, which has a built-in delay during changeover.  That delay eliminates the compressor noise.  To retrofit this board, be aware there are some differences in terminal labels.  It will also be necessary to reconfigure the yellow wire that comes from the thermostat.  On the R22 systems, the yellow thermostat wire goes through the low pressure switch and then directly to the contactor. On the newer systems that use this defrost board, the yellow wire goes through a high pressure switch (not used here) and then to the defrost board. A separate wire goes from the defrost board to the contactor.  You'll need to move/add those. The low pressure switch connects to the defrost board instead of being in series with the yellow wire. I recommend downloading the technical or specification manual for an R410 SSZ14 and the R22 GSH13 heat pump so you can compare the wiring diagrams for the old and new defrost control boards.  Also look up the data sheet for an ICM-314, a third party clone of this board. It has a simplified wiring diagram that shows exactly how everything connects.