Well, it'll click when it cycles on and off. If it's clicking rapidly then it may be low on R-134a or something else might be wrong.
Also, it only runs in the two "defrost" settings (well, plus the two "A/C" settings, but those are obvious). The heat-only setting, which I think is denoted by an arrow pointing at a person, does not run the compressor. Try that setting and see if you still hear the clicking.
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