Nuheat Thermostat Troubleshooting

The tables below contain the information about the troubleshooting process for Nuheat thermostat models. Each manual enlists the most widespread technical issues, possible reasons for malfunctioning, and solutions. Besides, the tables provide the error codes and explain what they mean: instead of searching for the printed instruction, you can check out this information.

Nuheat Solo Thermostat Troubleshooting

Error code Cause
GFCIThe GFCI has tripped. Reset the thermostat. If the GFCI trips again, cut power to the heating system from the main electrical panel and have the installation verified by an electrician
“—“It is normal that this briefly appears at power-up. Wait for the thermostat to obtain its reading. No corrective action is necessary
HIThe temperature reading is higher than 158 °F (70 °C). Although the thermostat does not display temperatures above that value, it continues to operate and control the temperature. No corrective action is necessary
LOThe ambient or floor temperature reading is lower than 32 °F (0 °C) or the outdoor temperature reading is lower than -40 °F (-40 °C). Although the thermostat does not display temperatures below that value, it continues to operate and control the temperature. No corrective action is necessary
Err01Two or more thermostats have been configured as “master' in the same network . Only one thermostat per network must be configured as "master". This error code will appear only on all thermostats configured as "master’ thermostats
Err02There is a short in the network wires. This can indicate the terminal polarity was not observed during the network cable connections. Although the error code appears only on the master thermostat, the short or bad connection can be anywhere in the network
Err03The floor sensor circuit is open. This can be caused by a cut in the sensor wires. Replace the floor sensor. The thermostat is automatically set to use the "Ambient" setpoint temperatures. The maximum heating power is 100% if the thermostat has been configured for a tile floor and 70% for a wood floor
Err04The floor sensor is shorted. This can happen, for example, if a nail or screw has been driven through the wires. Replace the floor sensor. The thermostat is automatically set to use the "Ambient" setpoint temperatures. The maximum heating power is 100% if the thermostat has been configured for a tile floor and 70% for a wood floor
Err05The ambient temperature sensor circuit is open. Replace the thermostat
Err06The ambient temperature sensor is shorted. Replace the thermostat

Nuheat Signature Thermostat Troubleshooting

Problem CauseSolution
Can’t connect to my wifi networkWrong passwordTry entering your password again. Be careful to enter uppercase and lowercase letters, numbers and symbols as needed. The Nuheat SIGNATURE thermostat can switch between three different keyboards to enter these characters.
Your network name is hiddenIf you have another device connected to your WiFi network such as your mobile phone, stand next to your Nuheat SIGNATURE thermostat and go into your phone's WiFi settings to see if the network name is appearing. If you do not see the network, it could mean that your network name is hidden. If your wireless network is hidden, it means you've chosen to not have the network name broadcasted to devices. In the WiFi Settings on the Nuheat SIGNATURE thermostat, select Other at the bottom and type in the name of your network (aka SSID). Then enter your password when you are prompted.
Thermostat is too far from WiFi routerTry connecting another device such as your mobile phone to your WiFi network. Standing next to your Nuheat SIGNATURE thermostat, go into your phone's WiFi settings. If the WiFi signal cannot be detected or is very weak on your phone, it means other devices may have trouble connecting to the network from that area of the home. This means you may be too far away from your WiFi router or there may be a problem with it. If your WiFi router is too far, you can purchase a WiFi signal repeater which will improve the range of the WiFi signal in your home for all devices.
Insufficient security settings on your WiFi routerWith so many home devices now connected to the Internet, we want to make sure our Nuheat SIGNATURE thermostats are connected to secured networks so that hackers cannot gain control of devices in the home. There are two main types of encryption or protection available through wireless routers; WEP and WPA. WEP is the original form of wireless security which offers very minimal security. Hackers can very easily break into your wireless network if your router is setup with WEP encryption. It was replaced with WPA encryption in 1999 and WPA2 in 2006. WPA is a security protocol that makes it much more difficult to break into the networks. The Nuheat SIGNATURE thermostat currently supports WPA and WPA2 encryption only. Nuheat is releasing a version of the SIGNATURE that will support WEP in the coming months. If your router was manufactured after 2003, you should be able to change the setting from WEP to WPA.Without a WiFi connection, the Nuheat SIGNATURE thermostat can still control your floor heating system. Nuheat recommends the best course of action is to upgrade your security settings to properly protect your network from hackers. If that is not an option, please contact Nuheat
Too many wireless devices connected to your networkSome WiFi routers have a limit on the number of wireless devices that can connect to the Internet. To test if this is your issue, shut down one of the WiFi enabled devices in your home. Once that device is completely shut down, try again to connect to the network with the Nuheat SIGNATURE thermostat. If the Nuheat SIGNATURE thermostat successfully connects, consult the documentation for your access point or contact your Internet Service Provider (ISP) to find out if you can increase the number of simultaneous connections to your WiFi network.
WiFi router requires a restart/rebootThe problem might be with your router (even if your other wireless devices are still connected). A simple restart of the router will usually resolve these types of issues. While most routers just need to be unplugged and plugged back into their power source to restart them.
WiFi router firmware needs to be updatedContact your ISP or the router manufacturer for instructions on how to updated the firmware.
Presence of wireless interferenceTry turning off other wireless devices (Bluetooth, WiFi, wireless phones/cameras) that may cause interference then test the Nuheat SIGNATURE thermostat's network connection.
SIGNATURE thermostat needs a factory resetRestart your Nuheat SIGNATURE thermostat. To restart the Nuheat SIGNATURE thermostat, go to Settings>Factory Reset and select Reset Once your Nuheat SIGNATURE thermostat has restarted, go to Settings>WiFi Settings to try to connect again.

Nuheat HMYDV Thermostat Troubleshooting

Heating is always On.Check the thermostat wiring.
Thermostat indicates that heating is On when it is not.
Thermostat is hot.Under normal operation, the thermostat housing may reach a temperature between 95°F (35°C) and 104°F (40°C).
Wrong temperature is displayed.Verify that the sticker on the thermostat's screen has been removed.
Temperature does not change according to the programmed schedule.Check that the thermostat is in Automatic mode. Check the schedule and dock settings.
Time display is flashing.The thermostat was without power for more than 4 hours.
The °F or °C does not appear.The thermostat has been configured as a power regulator and therefore displays the percentage of heating power instead of the temperature.

Nuheat Tempo Thermostat Troubleshooting

Error code Cause
LOThe measured temperature is below the thermostat s display range. Heating is activated
HIThe measured temperature is above the thermostat s display range. Heating is deactivated
ErVerify the thermostat and sensor connections