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Maintenance and Service

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Boilers

Keston

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Keston Qudos 28S - Faulty fan (Q10S301001) Error code E28

Keston Qudos 28s - no heating or hot water. Error code E28

  • The boiler pump is working but after 5 seconds the boiler goes into a lock out with an error code E28 which means faulty fan according to the manufacturer's instructions
  • Open the boiler casing and reset the boiler
  • Check the voltage to the boiler fan. If voltage to the fan is 240V then replace the fan
  • Check resistance between neutral and live terminals on the fan. A working fan should have around 40 Ohms resistance. A faulty fan will have around 2 Ohms.
  • The part number is Q10S301001 for Keston fan for this boiler
  • Completely isolate the electricity to the boiler when replacing the fan
< Go Back2017-03-03

Keston C55 - intermittent fault. Faulty PCB C17401000

Keston C55 system boiler goes into a lock out intermittently

The display shows different fault codes once or twice a day or every couple of days.

The PCB is faulty. Replacement part number is C17401000

< Go Back2016-04-19

Keston C40 - Low water pressure fault b26

Keston C40 - Low water pressure fault b26, boiler is not firing

< Go Back2013-11-29