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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

Halstead

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S960134NU Thermostatic Cartridge

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Halstead Ace High - faulty hot water micro-switch 500593

A boiler went to overheat lock out once a month when hot water was on. Then it began happening more often until it stopped producing any hot water at all. Heating was working fine.

Reason and solution:

  • Water was leaking through a domestic hot water spindle of a flow switch
  • This water went to a hot water micro-switch
  • It made the micro-switch to stuck in open position causing overheating
  • When water dried out the boiler came back to normal
  • It was happening until the micro-switch completely get broken
  • To fix - need to replace a hot water micro-switch
  • The part number is 500593
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