INSTALLATION AND OPERATION INSTRUCTIONS5-8SL 35-199, SL 45-260 MODULATING GAS BOILERSSYMPTOM DIAGNOSIS REMEDYTEMPERATURE SENSORERRORTouch Screen Message:Error - Max. Inlet/Outlet SensorTemp. Exceeded. -> Checkwater flowWater temperature signalnot within acceptable range.Potential flow or sensor failure.Consult service technician.Current outlettemperature exceedsoperating limit.• Check water flow.Defective ordisconnectedtemperature sensor.• Check wiring to temperature sensor andcontrol module.• Check temperature sensor. See Section5.2.1.MISCELLANEOUSTouch Screen Message :Blank – screen dark, but fanrunning Indicative of power-surge damage to appliance• Check transformer; replace if damaged.• Check circuit board for visible damage.5.3.2 Ignition ProblemsSYMPTOM DIAGNOSIS REMEDYNOISY SPARK WHENIGNITINGIgnition lead is notfirmly connected.Reconnect ignition lead.Contaminants/moisture on igniterprobe/flame sensor.Ensure probe is dry by re-running post-purge;otherwise, clean or replace igniter probe.BOILER RUMBLES WHENIGNITING.Fluctuating gaspressure/ gaspressure too high/toolow.Check CO2 level via analyzer.Check for proper gaspiping.Check pressure with manometer during ignition.BOILER WILL NOT ATTEMPTTO IGNITE. FAN AND PUMPARE OPERATING NORMALLY.No power to ignitioncontrol module.• Check system wiring.• Check air reference tubing.Igniter probe/flamesensor disconnected.Reconnect probe.Defective ControlModule.Check ignition output from control module.BOILER WILL NOT ATTEMPTTO IGNITE. FAN AND / ORPUMP ARE OFF DISPLAYNOT ILLUMINATEDNo power to boiler. Check line voltage .Defective transformer. Check transformer. Reconnect or replace asneeded.