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High temperature limit switch and temperature controller fails to shut off gas supply to boiler

Incident Investigation

High temperature limit switch and temperature controller fails to shut off gas supply to boiler

April 3, 2020

Boiler, PV and Refrigeration

Reference Number:

II-1000791-2020 (#16966)



Location: Chilliwack

Regulated industry sector: Boiler, Pressure Vessel & Refrigeration

Incident overview

The high temperature limit switch and temperature controller of a boiler located in the mechanical room of an apartment building failed to shut off the gas supply to boiler, causing a release of water at high temperatures through the safety relief valve.

 

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