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Nest Not working (rh wite no power) now has blank screen

MukeshPatel
Community Member

‎05-23-2024 02:47 AM

Got no power to Rh issue. Also seen e74 error message in between. Now there is no power and screen is blank. 

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CoolingWizard
Platinum Product Expert
Platinum Product Expert

‎05-23-2024 05:34 PM

@MukeshPatel, to test for proper power, you need a multimeter. Set the meter to measure AC voltage. Place one lead on R and the second lead on the C wire. You should see 24VAC +\- 5VAC.  If you see less than 20VAC your system needs service to replace the step down transformer.  

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
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