Error code e73 shows up on the Nest thermostat when the RC wire does not receive any power. This happens when the outdoor unit shuts down or if there are some other issues with the outdoor AC unit.
In some cases, the error can also occur because of any problems with the compressor of the thermostat along with other faulty components.
Fix For error code e73 on The Nest thermostat
Fix 1: The compressor is overheating
The compressor for the thermostat unit needs to be placed in an area with appropriate ventilation.
Even when the ventilation is proper, sometimes the compressor can overheat. When this happens, the compressor will shut down.
The compressor is a vital part of the functioning of the thermostat. If it is not functioning, the entire thermostat process will shut down.
So check if the compressor is overheating. If it is then try to shut down the device for a while and then check for the error.
Fix 2: The filters are blocked
The Thermostat filters are important to eliminate dust and other blockages from the device. This makes sure that there are no external hindrances in the working of the thermostat.
If these filters are not cleaned regularly, they can also be the cause of this error. So try clearing the filters by cleaning them and then check if this resolves the issue.
Fix 3: The outdoor fan motor is not working properly
The outdoor fan motor on the thermostat is an important part of maintaining the temperature of the device.
If for some reason, the outdoor fan motor has ceased to work, it can be a cause for concern. When you have tried the above solutions and they do not seem to work, check the functionality of the outdoor fan motor.
If you notice that the fan motor is working a tad bit slower, or is completely off, you need to take care of the issue before you can use the thermostat.
Fix 4: Get the outdoor AC unit serviced
As we have already discussed in the beginning in some cases, the outdoor AC unit can also be the issue behind the error. In this case, you might need to call in a technician for the servicing of the outdoor AC unit.
Fix 5: Call in a professional or contact the support team for The Nest thermostat
If none of the above options have helped you get rid of the error, there is a possibility of a serious wiring issue on the device. It is also possible that the device is working fine but the Nest software is not acting in compatibility with the thermostat.
So at this point, you should reach out to the professional or Nest thermostat support team.
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