What are the codes on a Honeywell thermostat?

Answered by James Kissner

Honeywell thermostats have various error codes that indicate specific issues or malfunctions with the thermostat or the HVAC system it controls. Understanding these error codes can help troubleshoot and resolve any problems you may encounter. Here are some common error codes you may come across on a Honeywell thermostat:

1. Error Code 164: This code indicates that the heat pump requires servicing. It could be due to a fault in the heat pump itself, such as a refrigerant leak or a faulty compressor. It is recommended to contact a professional technician to diagnose and repair the heat pump.

2. Error Code 168: This code signifies a Wi-Fi radio error. It means that there is an issue with the thermostat’s ability to connect to the Wi-Fi network. To resolve this, check your Wi-Fi settings, ensure the thermostat is within range of the network, and try restarting your router. If the problem persists, contact Honeywell support for further assistance.

3. Error Code 171: This code indicates that the date and time on the thermostat need to be set. You can set the date and time in the thermostat’s settings menu or follow the instructions in the user manual to synchronize it with your device.

4. Error Code 173: This code suggests a thermostat temperature sensor error. It means that the temperature sensor inside the thermostat may be malfunctioning or damaged. Check if the thermostat is properly mounted and not exposed to any external heat sources. If the issue persists, it may require professional servicing or replacement.

5. Error Code 175: This code indicates that the AC power has been restarted. It could be due to a power outage or a temporary loss of power to the thermostat. The thermostat should automatically resume normal operation once power is restored.

6. Error Code 181/182: These codes indicate that it is time to replace the air filter in your HVAC system. A dirty or clogged air filter can restrict airflow and reduce system efficiency. Replace the air filter according to the manufacturer’s instructions to ensure proper airflow and system performance.

7. Error Code 184: This code suggests that the humidifier pad needs to be replaced. The humidifier pad is responsible for adding moisture to the air. Over time, it may become clogged or worn out, affecting its ability to function effectively. Replace the humidifier pad as recommended by the manufacturer.

8. Error Code 185: This code indicates that the dehumidifier filter needs to be replaced. The dehumidifier filter helps remove excess moisture from the air. Similar to the air filter, it can become dirty or clogged, reducing its efficiency. Replace the dehumidifier filter as per the manufacturer’s instructions.

It’s important to note that these error codes may vary depending on the specific Honeywell thermostat model you have. Always refer to the user manual or contact Honeywell support for precise information and troubleshooting guidance tailored to your thermostat model.