11www.norcold.com/cda 1200XX/120X-IMXX ModelsRefrigerator Service ManualSr FS - Sr Fault Code – Flame sense circuit failuredc LO Fault Code – Low dc voltageNOTEElectronic controls operate on 12 Vdc. When an AC/DC converter is used tosupply DC power, the refrigerator circuit must be connected to the applianceoutput terminals of the converter (filtered side).If the refrigerator circuit is connected to the unfiltered side, the AC ripplegenerated by the converter may cause a "dc LO" fault code to display.To troubleshoot a "dc LO" fault, connect a charged 12 volt automotive batteryto the power board. If the "dc LO" code clears, the fault was caused byunfiltered DC power.If the "dc LO" code does not clear, replace the power board (see page 40).Fault indicator displayed:Replace power board.See page 40.Flame sense circuit failure.1 COLD - 9 COLDEST SET TEMP MODE ON / OFFon"Sr" FlashingCold ColdestONOFF MODETEMPSETAC LP GASAUTO"AC" LED Flashing"Sr" and "FS" FlashingAudibleAlarmAudibleAlarmBefore beginning this procedure:■ Make sure RV DC voltage to refrigerator is 10.5 to 15.4 volts.■ Determine if the "dc LO" fault code displays when the converter is the source of DC power.■ Make sure no other appliance or lighting circuit is connected to the refrigerator DC circuit.Fault indicator displayed:Voltagelower than10.5 Vdc?NOCheck RV 12 Vdc power supply torefrigerator.YESSee NOTE below to determineand correct low "dc LO" fault.Check for DC voltage inputto power board terminals12VDC and GND1.Cold ColdestONOFF MODETEMPSETAC LP GASAUTO 1 COLD - 9 COLDEST SET TEMP MODE ON / OFFonAudibleAlarm"dc" and "LO" Flashing"dc" and "LO" FlashingAudibleAlarm