Google Nest Thermostat Error Code E198: How to Fix It

Q: What does Nest error E198 mean?

E198 means the Nest thermostat has detected that your heating system is not functioning. It is not a thermostat hardware error but an alert about the HVAC equipment.

Q: How do I fix Nest error E198?

Start by checking power to the thermostat and HVAC system, inspect wiring, test equipment via the app, and verify heat pump settings if applicable. A factory reset may help if the issue is with the thermostat configuration.

Q: Can a low battery cause Nest error E198?

Yes, a low battery can cause the thermostat to lose connection or fail to signal the heating system, triggering E198. Charge the battery via USB or remove and recharge.

Q: Is Nest error E198 a hardware problem?

Usually not. It indicates a system heating issue. The thermostat hardware is likely fine; the problem is with the wiring, power supply, or the HVAC unit itself.

Q: Should I replace my Nest thermostat if I get error E198?

No, replacement is rarely needed. The error is almost always fixable with troubleshooting or professional HVAC service.

Abstract

Error code E198 on your Google Nest thermostat means the system is not heating. This typically indicates a wiring issue, a power problem, or a faulty component. Follow these steps to troubleshoot and resolve the issue.