This code indicates that the Flue ECO has tripped because the flue temperature has exceeded 190ºF. This switch has to be manually reset.
- Push the reset button in the center of the switch body to reset the switch.
- Monitor the actual surface temperature of the heat exchanger near the switch. If the switch trips again, proceed with the steps below.
- Disconnect the flue ECO on the rear of the heat exchanger from the wiring and measure it’s resistance. Resistance should be at or near zero (0) ohms. If there is infinite resistance (open circuit), replace the ECO.
- If the ECO is OK, disconnect the switch wiring from both the boiler and the ECO and check continuity of the wiring using an ohmmeter. Repair or replace is necessary.
NOTE: The common reasons for temperature switches to trip are a) low water flow through the boiler, b) poor heat transfer from water to the load, or c) flue blockage.
- Push RESET on the boiler. If the boiler tries to ignite or ignites and only runs for a short time and the F01 code returns, investigate the flue for blockage.
