So i replaced the monovalve last fall on my 300SDL Hat works fine, however yesterday when i set my temp to cold it blew ice cold A/C then for no apparent reason it went crazy and switched to strong heat.... Any insights to this problem? My outside temp gauge is also very off, and it reads very crazy erratic numbers ranging from 136 degrees f to 7 degrees f like last night, Is their any connection here??

You may have a failing CCU issue, quite common I understand.

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83 SD

84 CD