New Nest, new system, fan not as powerful

[mediehl]

I have a brand new HVAC system for electric forced air and AC.  I replaced a Honeywell with the Nest (the on/off clicking noises were driving me crazy!). It was an easy swap. However I immediately noticed a difference in the force of the fan. It's not as loud (not blowing as hard) and when the system turns off, the fan slowly turns off and makes an audible humming noise, and it's not the register vent. With the Honeywell the fan immediately turned off/on with the system and more powerful. I restarted and also reset the system with no changes. Faulty thermostat? It is what it is? 

[RenzJ]

Hi mediehl,

Thanks for visiting here in the Google Nest Community forum. We're sorry for any trouble this may have caused you. Let’s look deeper into this. please answer the following:

1. Are you from North America or Europe?
2. What type of Nest Thermostat do you have?
3. Send us a photo of your current wiring.
4. What is the make and model of your HVAC? 

Also, let's gather power readings of the Nest Thermostat. Follow the steps below:

For the Nest Learning Thermostat and Nest Thermostat E:

1. Press the thermostat ring to bring up the Quick View menu.
2. Turn the ring to Settings and press to select.
3. Turn the ring to Technical Info and press to select.

For the Nest Thermostat 2020:

1. Tap the touch bar to bring up the Menu view.
2. Slide your finger down to Settings, then tap to select.
3. Slide your finger to Equipment > Power Info.

Keep us posted.

Best,

Renz

[mediehl]

Hi. I am in North America. I have the 3rd generation learning nest. My system is a carrier, international comfort product electric forced air HVAC. Below are pics of the power settings and my wiring. Thanks!

 

 

[RenzJ]

Hello mediehl,

Thanks for the update. Let’s also try to remove the C wire and check if the issue persists. If it does, we might need to check the wires via a voltmeter.

For safety reasons, turn off the HVAC system's power at the fuse box or system switch.

Remove the display of the Nest thermostat, unplug the C wire, and unplug the RH wire.

• Set the voltmeter to AC current.
• Touch the C wire with the red test probes (positive wire) and touch the RH wire with the black probes (negative wire).
• You should get a voltage reading, and it should be around 24 volts.

If you’re not getting any voltage readings, we recommend that you contact our Nest Pro technician by going on their website, OnTech, or contact a local HVAC technician to look into your common wire.

I hope this will help, but if you encounter any problems doing this or if the issue persists, please let us know.

Thanks,

Renz.