The pilot assembly is a key part of gas-fired HVAC systems and water heaters. It includes the pilot light, thermocouple (or thermopile), and the gas supply to the pilot. The pilot flame ignites the main burner, while the thermocouple confirms the flame is present so gas only flows when it can be safely lit.
/ˈpaɪlət əˈsɛmbli/
The pilot assembly is a key part of gas-fired HVAC systems and water heaters. It includes the pilot light, thermocouple (or thermopile), and the gas supply to the pilot. The pilot flame ignites the main burner, while the thermocouple confirms the flame is present so gas only flows when it can be safely lit.
What does a pilot assembly do?
It keeps a small flame ready to ignite the burner and prevents gas flow if the flame is out.
Source: The Cooling Company
Pilot flame + thermocouple ensure safe ignition.
When a gas water heater stops heating, a technician checks the pilot light and thermocouple to restore safe operation.
If the pilot light keeps going out, schedule service to inspect and clean the pilot assembly.
“If the pilot light keeps going out, schedule service to inspect and clean the pilot assembly.”
Electronic ignition improved efficiency by eliminating always-on pilot flames in many appliances.
Why does my pilot light keep going out?
Common causes include a dirty pilot, failing thermocouple, or draft issues.
Can I relight the pilot myself?
Some systems allow it, but always follow the manual and shut off gas if you smell fuel.
Do all gas appliances have pilot lights?
No. Many newer appliances use electronic ignition instead.
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