Fault Codes/Rehlko/COOLANTFAULTRehlkoCOOLANTFAULTUnclassifiedEmissionsWhat This Code MeansFault shutdown; An X in a red circle on UI screenPossible Causes•Low coolant level or loss of coolantRelated Rehlko Fault CodesDEFAULT PARS WARNINGEEEECOMMUNICATIONSFAULTFREQUENCYFAULTBATTERYVOLTAGEFAULTNOECSCF0STATUS: LOSTVOLTAGEFAULTCOOLNT TEMP HIGH WARNING/SHUTDWNCRANK LOST WARNINGCOOLANT TEMP LOW WARNINGBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for COOLANTFAULT on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about COOLANTFAULTGET THE ANSWERFree account required — we'll bring your question with you.