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Hey fellas im new to the hvac field. today i was working on a Trane Water cool vertical heat pump. the unit have a contactor for the compressor and a relay with a set of NO contacts for the blower fan.... But when the unit is leave on a while the fan relay starts to make a buzzing noise and the fan cuts off.. Compressor stays on .... would u guys say its just a bad relay and change it out or also consider the Tformer which is a 75va??
 

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Or a problem with a wire connection, or thermostat if its an older mercury one.
 
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