Heat pump won't go into defrost cycle

Old 12-28-04, 01:32 PM
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Heat pump won't go into defrost cycle

Have just installed new defrost cyle board and unit still does not go into defrost mode. The unit is Ruud, and the old defrost board has mfg. part #149-600 and the new defrost board is 47-21517-82. Thanks for help.
Old 12-28-04, 04:23 PM
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be sure the defrost sensing bulb is fiirmly attached to the refrigerant line. will it go into defrost when in test position?

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