Electrolux T5675 - Page 143

Troubleshooting
143
21:3NOINTERLOCK
ThiserrorcodeisgeneratedbytheMCUfordrummotor.
TheMCUmustbepoweredwith230V/50or60Hzontheinterlockinputinordertodrivethemotor.
Thissignalisaconrmationthatthedoorisclosedandlocked.
MCUreceivesitscommandstorotatethedrumfromtheCPUviaaserialcommunicationlink
betweentheMCUandCPU.SincetheCPUalsohasaccesstotheinterlocksignal,theCPUmust
neversendaruncommandtotheMCUiftheinterlocksignalismissing.Ifthisdoeshappen,
thiserrorcodewillbeshown.
Possiblecauses:
Thecauseofthiserrorcodebeingactivatedcanbee.g.abreakinthecableleadingtheinterlock
signaltotheMCU.Theremayalsobeanerrorintheconnectorinthedoorlock,whichconnects
230V/50Hztotheinterlocksignal.AnerrorintheinterlockcircuitsoftheMCUcanalsosetthis
errorcode.
Recommendedactions:
1.UseamultimetertocheckthattheinterlocksignalispresentonX302:1-2whenthedoorlockis
activated.Readalsobit1inthesecondbyteunderMCUSTATUSintheserviceprogram(the
bitsarenumberedfrom0to7wherebit0isonthefarright).Ifbit1inthesecondbyteis1then
thelockisopen,whilea0indicatesthatthelockisclosed.
2.Replacethedefectivepart.
21:4NOCOMMUNICATION
ThiserrorcodeisgeneratedbytheMCUfordrummotor.
MCUdetectsthereisthereisaproblemincommunicationwithCPU.
Possiblecauses:
BadcontactinharnessorconnectorsbetweenCPUandMCU.
Recommendedactions:
1.Checkwiring,connectionsbetweenCPUandMCU.