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I had a power surge and now my controller is not working properly. What could be the cause of this problem?

A power surge may damage the network controller and/or the thermostats. Check the NT-IPXB controller and make sure it has information scrolling across the LCD. Try logging in to the controller via IP address in a browser and see if it is showing up. If it is showing up, make sure all the settings are correct. If all settings are correct, try doing a power cycle on the controller. If it is still not connecting, check the thermostats to make sure there is not a bad thermostat in the chain (XBus) somewhere by pulling off the faceplates one by one and see if the connection re-establishes during this process. You may also check the X1 and X2 terminals to make sure they did not get shorted out. If you are still having issues you may have a damaged controller, contact support for further troubleshooting.