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or the control board flashing a Code 31
Robust Environmental Protection: Class F insulation rating prevents winding failure due to thermal stress and humidity
whether from the thermostat opening or a momentary utility brownout
allowing technicians to access real-time status through the user interface and review comprehensive boiler error code history for rapid troubleshooting
Dwyer Instruments SFI-100-1/2 Indicator 319847-401 or the control board flashingThe Dwyer Instruments SFI 100 1 2 is a field proven midwest sight flow indicator designed for immediate visual verification of fluid movement. Integrated with a 1 2" NPT female connection, this unit features a single window design with a high visibility rotating impeller that provides clear confirmation of flow rates in both liquid and gas applications. Constructed with a heavy duty bronze body and a tempered glass window, it is built to withstand the
