Installation Manual - Unical Lattner Condensing Hot Water Boilers

Fault findingCode:Description: Modulating fan failureCode:Description: Alteration of the operatingparameters caused by EMC disturbancesCorrective action: Check the fan’s wiringCorrective action: Restore the factory parametersCode:Description: Modulating fan failureCode:Description: Flame signal detected before theignition cycleCorrective action: Check the fan’s wiringCode:Description: Lack of water (only for pumpequipped with SensorLogic)Corrective action: Disconnect the detectionelectrode’s wire from the control board; if the errorcode disappears replace the cable, otherwisereplace the control board.Corrective action: Fill-up the water circuitCode:Description: Flame detected after burner OFFCode:Description: Main heat exchanger frozenCorrective action: Carefully de-frost the exchangerCorrective action: Disconnect the gas valve’s wirefrom the control board; if the error codedisappears replace the control board, otherwisereplace the gas valve.Code:Description: Intervention of the high limitthermostat (TL)Code:Description: Internal failureCorrective action: Press the reset key on thecontrol panelCorrective action: Replace the control boardCode:Description: Heating sensor failureCorrective action: Check the sensor’s efficiencyand/or wiring51