39DetectionDelayFaultFlow SwitchBlower SwitchFactory OptionExternal InterlockCWS/CWRIgnition Lockout*Toggles Between /Hi DeltaPVC Vent Limit-CHXManual High LimitAuto High LimitLow Water Cut-offVent PressureLow Gas PressureHigh Gas PressureController AlarmPower On / No CFHSystem NormalStandby / WebSite*Power On / CFHSystem NormalCFH Active / WebSite*6 Internal Cntrl Fault Internal Cntrl FaultRecycle/Reset Cntrl, Replace ControlCondition LCD Display Without Fault4 Low HSI Current Low HSI CurrentCheck HSI Current, Replace HSI, Recycle Power, Replace Ign.5 Low 24VAC Low 24 VACCheck Power Supply, Check Transformer2 Flame - No CFH Flame - No CFHShut Off Gas Supply, Recycle Power3 Ignition Lockout Ignition LockoutRecycle/Reset Cntrl, Push Reset ButtonFieldInterlock #Flashes LCD Display Readout With Fault1 Low Air Low Air FaultCheck Blower, Check Filter, Check Air Sw. Hose1Ignition LockoutDisplay actual Fault Flash CodeRecycle/Reset Control, Push Reset ButtonSee Table Below90Field Interlock ErrCheck Louvers, Check Comb. Damper, CheckExtractor Sw.3CWS/CWR FaultConfirm Inlet Temp, Reset CWS/CWR Cntrl3Blower Air Sw. FaultCheck Air Filter, Check Blower, Check Air Sw. Hose3Factory Option FaultCheck Factory Data, Check Wiring Diagram, CheckFreeze Control, Check Water Pressure1Controller AlarmSee Control Display3Water Flow Sw FaultCheck Boiler Pump, Purge Air, Replace Flow Switch1Lo Gas Press FaultConfirm Settings, Check Supply Gas, Reset LGPS1Hi Gas Press FaultConfirm Settings, Check Supply Gas,1Lo Water Cutoff ErrPurge Air, Check Pump, Chk Isolation Valve,Reset LWCO1Vent Pressure FaultBlocked Vent, Check Vent System1Man Hi Limit FaultConfirm Settings, Reset Hi Limit1Auto Hi Limit FaultConfirm Settings, Check PumpLCD Display Readout With Fault1Cond Drain Blocked/Vent Temp Limit ErrCheck Drain Switch, Check Drain/Check Vent SystemTable R: UDB Fault Messages