Fault Codes/Rehlko/20771Rehlko20771UnclassifiedGeneralWhat This Code MeansUnit failed to report heartbeatRelated Rehlko Fault Codes21247212562007516281 152006516284 172005516600 32004516600 42003516663 0Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 20771 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about 20771GET THE ANSWERFree account required — we'll bring your question with you.