Vent temperature limit exceeded.
- Inspect all flue piping. If the flue is damaged or shows signs of overheating, repair or replace the flue parts as necessary before proceeding.
- If the flue piping system is intact, not damaged and there is no sign of the flue overheating (such as discoloration or melting), push the red reset button on the flue switch
- Be sure the heater is connected to a water supply and full of water.
- Push the RESET button on the heater control panel. The water heater should light. If the water heater lights, proceed to step 5. If the water heater does not light and the display again begins to flash F01, inspect the wiring to the flue switch, repairing or replacing as necessary. If the wiring is intact, replace the flue switch, using care to mount the new flue switch in the same position and mounting holes as the old one. If the display flashes a code other than F01, follow the troubleshooting guide for that code.
- Observe operation for 5 minutes. Place the probe of an exhaust analyzer into the flue system within 6 feet of the heater. The exhaust temperature should not rise above 190oF after several minutes of operation.
- If the flue temperature is below 190oF and the heater again goes into lockout displaying F01, replace the flue switch, using care to mount the new flue switch in the same position and mounting holes as the old one. If the display flashes a code other than F01, follow the troubleshooting guide for that code.
- If the flue temperature increases to over 190oF, consult HTP for further assistance.
