ECO circuit 2
Vent temperature
High Gas Pressure (if equipped)
Low gas pressure (if equipped)
Low level (if equipped with UL353 LWCO)
Thermal Fuse (if equipped)
- If the boiler is equipped with High and/or Low gas pressure switches, examine the yellow LED lights on each switch. If lit, correct the gas supply problem associated with the switch. Then, reset the switch by pressing on the cover of the switch over the red button. Pressing the button requires a firm push. Finally, press the RESET button on the front panel of the boiler to reset the boiler control.
- If the boiler has a UL353 LWCO, check to see if the red LED on the LWCO control box is illuminated. If so, correct the low water condition and press the reset button on the LWCO control box to reset it. The LED should change to green. Finally, press the reset button on the front panel of the boiler to reset the boiler control.
- Check the flue for obstructions or any sign of damage, especially signs of excessive heat. Repair as necessary. Push red reset button on flue temperature switch located on the flue inside the rear access door of the boiler.
NOTE: Switch temperature must be less than 90oF to reset. Run the boiler and check the flue temperature. If the flue temperature is within specs and the switch trips, replace the switch. If the flue temperature is excessive, check and adjust the combustion controls on the boiler. If problem persists, inspect the target wall in the combustion chamber and replace it if cracked or damaged.
- If the boiler is equipped with a Thermal Fuse, ensure all wiring to and from the thermal fuse is secure and intact. Next, check for continuity across the thermal fuse with an ohmmeter. If the ohmmeter registers as open, the thermal fuse needs to be replaced.
NOTE: Before replacing a thermal fuse, remove the gas valve, blower, and burner assembly and inspect the heat exchanger and target wall for damage. This is a VERY IMPORTANT procedure, as the heat exchanger may be damaged and need to be replaced, and should only be performed by a qualified, highly experienced service technician.
