Fault Codes/Rehlko/DC 2100RehlkoDC 2100UnclassifiedGeneralWhat This Code MeansDC 2100Suggested Actions1Replace the controller2Contact an authorized distributor/dealer for serviceRelated Rehlko Fault CodesDWN ARECURRENT A HIGH WARNINGE 88CONCHECKINGE05COMMON WARNGECM ADDR ERR SHUTDWNCOMMON FAULT SHUTDWNECM COMM ERR SHUTDWNCMECM MISMATCH SHUTDWNBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for DC 2100 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about DC 2100GET THE ANSWERFree account required — we'll bring your question with you.