LENNOX Package RTU Not cooling, step by step troubleshooting 

Thanks please share it to your friends

@@influenz1490 thanks watch my other videos and share

Thanks

Thanks

Thanks

Thanks

Thanks

Thanks

Yes that was pressure switch on liquid line, that should close on high pressure as ambient temperature was 75F should be close just like other pressure switch for different fan

Well that depends what is ambient temperature is if it is too low then it takes some time to build up pressure in condensor coil and to activate fan motor relay, if it is too hot then fan starts right away just like other fan in the video was starting, board has nothing to do with it

That was not relay it was pressure switch actually, and I start from the component which is not working, and Traced it backward for root cause

The relay was working properly but not receiving 24v to activate it for that reason the motor not working. 24v was controlled by LPS in this case.

@@joseantoniopadronhidalgo8016 yes

Sorry, a newbie here. I understand that the relay was working but I don't get how you knew it wasn't the relay by moving the black wire from lower terminal to upper terminal.

@@yoyoman3386 ok I check step by step, condensor fan motor was not working I checked motor, it was ok then supply motor voltage by bypassing relay which was by moving black wire, motor started next step was why relay wasn't working so Traced relay through wire diagram, and found pressure switch was faulty