ESIE15-08B | Part 2. Troubleshooting 3. Symptom based troubleshooting19/07/16 Page 63Daikin Altherma Monobloc CA3.14. Outdoor unit is iced up (defrost problem)3.15. Energy metering is 'wrong'Possible failures Root cause Check Corrective actionRoot cause category: hardwareGeneral ice build-up. Outdoor unit installation mustbe protected from weather(wind, snow, ...).Refer to Installer ReferenceGuide for correct installation.Ice build-up on the outdoorunit.• Clogged drain holes.• Snow on the OU.• Ice building up on thecasing.Ice is not in direct contact withfins.• Unclog drain holes orremove any scraps thatcan be used for ice to buildup.• Remove ice.Defrost operation malfunction. Not enough defrost power:shortage of refrigerant.• Check refrigerant charge.• Check for leaks.• Replace refrigerant.• Fix leaks.Ice build-up at entry spot ofrefrigerant.Refrigerant shortage. • Check refrigerant charge.• Check for leaks.• Replace refrigerant.• Fix leaks.Partial ice up of coil. Partial refrigerant blockage. Check refrigerant circuit. Replace part where blockageoccurs.Dirty coil. Check if coil is dirty. Clean coil.Bad weather conditions. Unit is not powerful enough todefrost due to too strong wind,snow, ...Outdoor unit installation mustbe protected from weather(wind, snow, ...).Refer to Installer ReferenceGuide for correct installation.Possible failures Root cause Check Corrective actionRoot cause category: SoftwarekWh values measured with fieldsupplied meters show differentvalues as the user interface.Backup heater wiring is not cor-rectCheck backup heater wiring,refer to installer reference guideAdjust wiring if requiredValues on user interface areincorrect, show strange values.User interface is replaced orreset to factory settings; Previ-ous measurements are lost.Check if user interface isreplaced or reset.Reset measurements of fieldsupplied electrical meters andreset user interface to factor set-tings and reset hydro PCB tofactory settings.Values on user interface areincorrect, show strange values.Hydro PCB A1P is replaced orreset to factory settings; Previ-ous settings are lost.Check if hydro PCB A1P isreplaced or reset.Reset measurements of fieldsupplied electrical meters andreset user interface to factor set-tings and reset hydro PCB tofactory settings.Unit operates in emergencymode.Backup heater is allowed inemergency mode, setting[A.5.1.2=automatic]Check setting [A.5.1.2] If you don't want the backupheater to run automatically inemergency mode, adjust setting[A.5.1.2]
