Trane RTU With Faulty Blower Relay! Almost misdiagnosed!

A PM tech suspected a low refrigerant condition or a restriction in the refrigeration circuit on a Trane Heat Pump RTU that I recently installed a new condenser motor on. After a full diagnosis I determined it to have a faulty blower relay.
Condenser motor replacement video
• Trane RTU making “stra...
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[@stevencossaboon3237]

Great job and video. Thank you for the knowledge.

[@led_handymanservicesocalif6432]

I just found you and love ❤️ your content

[@JeffsHVACAdventures]

Thanks for watching!

[@Chris-Hn]

Keep going

[@EverythingHVACR]

Good intuition. The board seems like your issue. It's gotta be. The refrigerant looked ok. Nice job

[@JeffsHVACAdventures]

What I was thinking too. Thanks for watching!

[@led_handymanservicesocalif6432]

It looks burnt 🥵 on top 🔝

[@JeffsHVACAdventures]

Yea she does a little

[@thatguy9088]

Hello Jeff. Thank you for the videos. Apprentice here and have a RTU doing something odd. The unit will run anywhere for 1-3 hours and then the coil exhaust fans shut off. The compressors run, the fan motor runs, but the motors just shut down. The crazy part is if I turn the unit off, and check fuses and voltage (all read normal) and turn the unit back on, it will run for another 1-3 hours like nothings wrong. I am thinking high limit? Any advice? Thanks in advance.

[@JeffsHVACAdventures]

Maybe a limit. Is there any low ambient controls or fan cycling switch on the unit?

[@thatguy9088]

@@JeffsHVACAdventures There is a main disconnect, and a thermostat. Its a York Predator, older kind if I had to guess. Spent an hour looking at it today, before I got put on something else. Will be looking at it again tomorrow, but I am honestly stumped. It just isn't making any sense. But I don't "think" there is a fan cycling switch, I do know the digital thermostat has a "hand" mode where you can force the unit on, but that just turns the blower motor on, not the coil exhaust fans. I have never seen a unit work after for a few hours after a power shutoff, but I fear burning something up. We can't just keep resetting it like that.

[@led_handymanservicesocalif6432]

Have you tried the SupcoTradeFox JumperKing

[@JeffsHVACAdventures]

I have not personally used it but a co worker has one and seems to like it.

[@led_handymanservicesocalif6432]

@@JeffsHVACAdventures Awesome 😎 Do you have Instagram

[@JeffsHVACAdventures]

@@led_handymanservicesocalif6432 no but ive been thinking about starting a page

[@led_handymanservicesocalif6432]

@@JeffsHVACAdventures Same concept different platform and you need it Today to make this KZbin Channel Better

[@flickaclit6997]

You think the contacts are pitted??

[@JeffsHVACAdventures]

Possibly. This call was awhile back. Can’t really remember the particulars of it.

[@jrh86]

Visually looking a bit cruddy 👍👍

[@JeffsHVACAdventures]

Sure did!