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The flame was lost while the boiler was firing 3 times during 1 demand call. The red light will display and the word LOCKOUT will flash. This code indicates a serious safety issue. The boiler will not restart until the cause of flame loss is determined by a technician and he pushes the RESET button on the display. During this lockout fault, the pump will be on as indicated on the second line of the display.
- Monitor the gas pressure to the boiler while in operation.
- Assure that the flame is stable when lit.
- Check to see if the display readout changes from “GAS VALVE ON” to “RUN” within a few seconds after the boiler ignites.
- Check the FLAME signal on the status display. It should be above 1.0 when the boiler is firing.
- If the signal reads less than 1 microampere, clean the flame rectifier and spark probe.
- If the problem persists and the ‘FLAME” signal is still less than 1.0, replace the flame probe and spark igniter probe.
- The flame signal should be steady after the boiler has been firing for 1 minute and is normally at 5.0 to 9.0. If the flame signal is not steady, disassemble the burner door and check the burner and its sealing gaskets.
