Removing And Changing Components - andrews MAXXflo EVO CWH 90/302 Installation And Maintenance Manual

6.2 REMOVING AND CHANGING COMPONENTS

DANGER
NONE OF THE CONTROLS ARE REPAIRABLE . IF THEY ARE NOT FUNCTIONING THEY MUST
BE REPLACED In all cases, before work commences turn off the mains electricity and gas supply.
The following items do not require isolating water before removal:
1. DHW tank temperature sensors
2. Flue temperature sensor
3. Common flow temperature sensor
4. The heater GUI display
5. Master & Slave controller PCB
6. Spark generator
7. Combustion fan
8. Gas valve
9. Electrode removal
10. Back flow prevention flue valve
11. Overheat thermostat
12. Air pressure switch
The following items require isolation of water before removal and bleeding air afterwards:
13. Heat exchanger
14. Heat engine circulation pump
15. Water pressure sensor
6.2.1 DHw TANK TEMPERATuRE SENSOR (b3)
• Remove and withdraw the foam insulation above the top of the tank
• Gently pull the sensor up the dip tube
Sensor
• Undo the bulkhead seal and pull the sensor through to the front.
Bulkhead seal
• Unplug connector from loom.
Sensor connector
• Cut off securing tie and remove sensor.
• Replacement is the reverse.
Maintenance
Remove cable tie
59 MAXXflo EVO