When your Nest thermostat displays an error code of “E298”, you need to check for the possible causes. Some of the most common reasons include a blown fuse or a backup battery. It may also be a case of a malfunction in the wiring. Fortunately, these problems are fairly easy to fix and will not require a professional to diagnose.

Float switches

If you’re experiencing an e298 Nest error code, you might be having trouble with your thermostat or float switches. If this is the case, you’ll want to replace them as soon as possible. In some cases, float switches are self-resetting, so you don’t have to do anything, but if they are not, you’ll need to check out your thermostat’s Nest Pro.


First of all, check the float switch. If the switch is not functioning properly, you may have a clogged switch. If you can remove the clog, you can turn on the thermostat again. If the problem persists, you may need to replace the float switch altogether.

Another issue with the thermostat is an overcurrent problem. An overcurrent error can damage the internal components and cause a fire hazard. If you suspect this error, turn off the power to the Nest first. If that doesn’t solve the problem, you may need to call an HVAC technician. A technician can check your wiring and make the necessary repairs.


Clogged drains

If your Nest thermostat has a “C” error code, it means that it’s having a problem communicating with its control system. The error code could originate in the control board or breaker box, or it could be a problem with a wiring connection in the thermostat itself. If you notice the code, you should shut off power to the unit and then call a qualified technician to check the wiring.

If you can’t find the faulty component, try replacing the fuse in your Nest. You may also try contacting Google customer support for assistance. Either way, they should be able to help you find the issue and fix it. If that doesn’t work, you can always try resetting the thermostat, but you can try other solutions first.

Another possible reason for an E298 Nest error code is a clogged filter in your HVAC system. Clogged filters can cause HVAC systems to shut down. If you want your Nest thermostat to work properly, make sure your HVAC equipment is in good shape and clear the dust filters. If these solutions don’t work, try consulting the Nest website for further troubleshooting tips.

An overcurrent error code in the Nest thermostat can cause it to shut down, which can be a fire hazard. Shutting down the power to the Nest will help you determine if the problem is with the thermostat or the wiring itself. If the problem persists, call a technician to examine the wiring. The technician will first need to reboot the thermostat. Then, they will need to check the connectors and wiring diagram to see if the connector is damaged. If the connector is damaged, the technician will swap it out.

Dust filters

If you’ve noticed that your Nest thermostat is not working correctly, chances are it is because of the dust filters. These can cause the HVAC system to trip and shut down. The Nest thermostat can also be affected by a problem with the battery, which may prevent power from reaching the cables.

If you’re experiencing this error, there are a few things you can do to troubleshoot the problem. First, make sure the dust filters and drains are in good shape. Clogged dust filters and drains can cause HVAC systems to trip switches and shut down. Clean these filters and drains to ensure your Nest thermostat is working properly.

If you’re unable to figure out the cause of the error, the next step is to shut down your Nest thermostat and contact a technician. This technician can check the wiring system and determine the exact problem. In most cases, the problem is related to the HVAC equipment. A professional will be able to diagnose the problem and recommend an alternative solution.

Misconfigured wiring

If you’ve got a Nest Learning Thermostat and are experiencing error code E298 on your device, the issue is likely related to misconfigured wiring. This code is usually caused by a blown fuse, which you can replace to correct the problem. After this fix, your Nest should continue to work properly.

If you are unable to fix the problem, the solution is to update the Nest thermostat. To update your Nest thermostat, visit the Settings menu and click on Software. If this doesn’t fix the problem, you should purchase a Nest Power Connector. This wire is necessary for the thermostat to work properly.

If you’re not comfortable trying to change the wiring yourself, contact a Nest technician. The technician will first perform a factory reset and review the wiring diagram. Next, they’ll begin inspecting each wire individually. Look for any bare copper or loose wires.

Another common cause of the E298 Nest error code is misconfigured wiring. A mistake in the wiring may cause the thermostat to switch to the battery backup system. Check all connections and replace if necessary. Make sure the thermostat is connected to the electrical system with a common wire.