Fault Codes/Rehlko/RS-35RehlkoRS-35UnclassifiedCoolingWhat This Code MeansHigh coolant temperature warningRelated Rehlko Fault CodesRS-36RS-40PHETSPD SENS FLTP1-24SPEED SENSOR FAULTP1-18SPN 730 FMI 3P1-17SPN 730 FMI 4P1-15SPN 966 FMI 31Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for RS-35 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about RS-35GET THE ANSWERFree account required — we'll bring your question with you.