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warning Honeywell

Error Code Red Light is On

Emergency Heat mode is active. The red light indicates the thermostat is operating in emergency heat mode.

? What Causes This

Thermostat is set to or has switched to Emergency Heat mode, typically due to heat pump malfunction or low outdoor temperatures.

✓ How to Fix It

  1. Verify the thermostat is in Emergency Heat mode.
  2. If Emergency Heat mode is not expected, contact a qualified service contractor for repair.
  3. Check that the heat pump is functioning properly.

This error code appears in:

Honeywell RTH7600D Programmable Thermostat