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.