Fault Codes/Rehlko/OVERTEMP FAULTRehlkoOVERTEMP FAULTUnclassifiedElectricalWhat This Code MeansEngine fails to start; Low cranking voltage; Slow warmup; Hunting idlePossible Causes•Battery failure•Coolant pump failure•Thermostat failure•Fuel regulator failure•Gas valve failureRelated Rehlko Fault CodesREACTIVE POWER LOWREAL POWER HIGHOUREAL POWER LOWLO CRANK VLTREPLACE CLOCK BATTERYLBRY CRLO WARNING WHBSFS (1A-T)UFBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for OVERTEMP FAULT on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE