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Maintenance and Service

Alfa Laval

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Alfa Laval Cetetherm Mini City - faulty central heating motor M6410C2031

Alfa Laval Cetetherm Mini City - No heating but hot water works

  • If there is no heating but hot water works then check air trapped at the top of the boiler and release by opening a manual air vent (recommendation to replace with an automatic one 3/8)
  • If there is no air then check the pump and a white Honeywell diverter valve on the right hand side
  • if the pump is spinning then check the diverter valve
  • The diverter valve is a slow opening one. It senses the ambient temperature from the room stat and opens accordingly. The full opening might take up to 45 minutes
  • If the valve doesn't open at all (the red plastic will move down) then replace the motor
  • The replacement part is Honeywell M6410C2031 actuator + manual override 24v 300n
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