Lochinvar Fire Tube Boiler FTX600N

WARNING! The boiler contains ceramic fiber materials. Use care when handling these materials per instructions in the FTXL Service Manual. Failure to comply could result in severe personal injury.

Follow the “To Turn Off Gas to Appliance” instructions for the boiler in Section 10 - Startup.

Do not drain the boiler unless it will be exposed to freezing temperatures. If using freeze prevention fluids in the system, do not drain.

Allow time for the boiler to cool to room temperature if it has been firing.

Remove the bezel from the unit.

Remove the screw securing the fan and venturi from the fan plate and set aside.

Remove the nuts securing the fan plate and burner from the heat exchanger plate and set aside.

Loosen the heat exchanger bolts to remove the heat exchanger top plate.

Disconnect the condensate hose from the condensate trap and route to drain.

Warning: This procedure requires trained personnel with PPE!

Inspect boiler ground wire from the heat exchanger access cover to ground terminal strip

Verify all wiring is in good condition and securely attached

Check ground continuity of wiring using continuity meter

Replace ground wires if ground continuity is not satisfactory

Sign off on the Ignition Ground Wiring Check

Warning! Failure to inspect for the above conditions and have them repaired can result in severe personal injury or death

Visually inspect the entire flue gas venting system for blockage, deterioration or leakage

Repair any joints that show signs of leakage

Verify that air inlet pipe is connected and properly sealed

Verify that boiler vent discharge and air intake are clean and free of obstructions

Sign off on the vent and fuel piping inspection

Ignition and flame sense electrodes removed from the boiler heat exchanger access cover

Upload a photo of the removed electrodes

Deposits accumulated on the ignition/flame sense electrode removed using sandpaper

Were the electrodes cleaned satisfactorily?

If the electrodes cannot be cleaned satisfactorily, replace with new ones

Ignition/flame sense electrode replaced

Is the gasket in good condition and correctly positioned?

Sign off on the electrode inspection

Warning: This procedure should be performed by trained personnel only.

Flame signal reading on the display

Is the flame signal at least 10 microamps?

If the flame signal is lower than 10 microamps, proceed with the following steps.

Ground wiring in good condition

Did cleaning the flame sense electrode improve the flame signal?

If cleaning did not improve the flame signal, replace the flame sense electrode.