The reverse valve port (O/B) is not been supplied with power

[jdelosco]

I have a Rheem 1 stage Heat pump with Aux heat. This system needs the reverse valve to be powered when heating (rheem).
I have followed the Nest Pro installer guide and copied the setup on page 12 (second picture) to do the wiring.

I followed the prompts to set up the thermostat and selected (B) for the O/B option (My rheem unit needs to power the Reverse valva when heating).

The reverse valve port (O/B) is not been energized either on heating or cooling.

My AC unit works with my old thermostat!

I hope someone can help (@Patrick_Caezza ??).

[CoolingWizard]

@jdelosco , there are a couple things that are typical when this type of a problem shows up. One is the wiring itself, ensuring that the wire be inserted into the OB connector is properly flat and fully inserted to the second notch. Yes indeed Rheem heat pumps are B types.  Can you post a clear picture of your Nest base showing the wires attached?

AC Cooling Wizard

[jdelosco]

[jdelosco]

I think the wire is correctly attached. I can see the thermostat recognize it. I attached both pictures

[jdelosco]

I moved the Fan wire to the OB port to troubleshoot the thermostat, but the fan did not start.

[ByronP]

Hi jdelosco,

Thank you for your response. I really appreciate the help @CoolingWizard. Let's find together a solution.

I would like to look into an additional troubleshooting steps:

Please check if your system has a energy savings box:

Some utilities install boxes cut off power during high demand (peak) times. This can cause the error. Check for one of these boxes on your line.

1. Check your meter (possibly near your air conditioner).
2. Look for a small box with one or 2 lights on it (one light is red, the other is usually green).
3. This box allows the utility company control to cycle your air conditioner off and on during certain peak times of the day. 

Also please check power reading on the Nest Thermostat:

Collect power readings from Settings/Technical Info. If necessary, use a voltmeter if you have one available. Remember, low VOC (Voltage Open Circuit) can diagnose a power problem. The range should be between 29 to 42V.

Please keep me posted. I'll look forward to your response.

Regards,

Byron