maintenance guide Main 2.3 PCB MAIN PCB MAIN PCB Tools Time 7 min 1 After opening the control box, disconnect the electrical plug connectors Unscrew the two screws and remove the PCB Display PCB 2.4 DISPLAY PCB DISPLAY PCB Tools Time 7 min 1 Unclip the cover to remove Lower the door and remove the two control knobs Unscrew the four screws and pull the assembly towards you 2 Disconnect the electrical plug connectors, unlock the four clamps, and remove the PCB 46
maintenance guide Hydraulic Unit Right 3.1 hand RIGHT hydraulic HAND block HYDRAULIC assembly BLOCK ASSEMBLY CLAS 24/30 FF LEGEND 1. Diverter valve motor 2. Diverter valve 3. Auto air vent 4. Primary water pressure switch 5. Pump 6. Central heating filter 7. Not applicable in UK 8. Non-return valve 9. Non-return valve assembly 10. DHW flow switch assembly 11. Central heating return 12. Cold water inlet (DHW) 13. Central heating drain valve 1. Auto air vent CLAS SYSTEM 21/28 FF LEGEND 2. Primary water pressure switch 3. Pump 4. Central heating filter 5. Central heating return 6. Central heating drain valve 47
maintenance guide Main 2.3 PCB MAIN PCB MAIN PCB Tools Time 7 min 1 After opening the control box, disconnect the electrical plug connectors Unscrew the two screws and remove the PCB Display PCB 2.4 DISPLAY PCB DISPLAY PCB Tools Time 7 min 1 Unclip the cover to remove Lower the door and remove the two control knobs Unscrew the four screws and pull the assembly towards you 2 Disconnect the electrical plug connectors, unlock the four clamps, and remove the PCB 46
maintenance guide Hydraulic Unit Right 3.1 hand RIGHT hydraulic HAND block HYDRAULIC assembly BLOCK ASSEMBLY CLAS 24/30 FF LEGEND 1. Diverter valve motor 2. Diverter valve 3. Auto air vent 4. Primary water pressure switch 5. Pump 6. Central heating filter 7. Not applicable in UK 8. Non-return valve 9. Non-return valve assembly 10. DHW flow switch assembly 11. Central heating return 12. Cold water inlet (DHW) 13. Central heating drain valve 1. Auto air vent CLAS SYSTEM 21/28 FF LEGEND 2. Primary water pressure switch 3. Pump 4. Central heating filter 5. Central heating return 6. Central heating drain valve 47
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