QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
A high efficiency furnace's main burner shuts off after initial ignition
Which part should be tested?
☐ Flame sensor
☐ Expansion valve
☐ Solenoid valve
☐ Gas valve
A toilet is cycling on and off, and the tank is refilling every few minutes. What should you check first?
1) flush valve
2) fill valve
3) flapper
4) handle
5) overflow tube
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Answer
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Step 1: Identify the problem in the first scenario.
The main burner of a high efficiency furnace shuts off after initial ignition.
Step 2: Recall the function of each part and how it could contribute to the problem.
Flame sensor: It detects the presence of a flame and signals the gas valve to stay open. If it fails, the main burner will shut off after initial ignition.
Final Answer
Flame sensor: It detects the presence of a flame and signals the gas valve to stay open. If it fails, the main burner will shut off after initial ignition.
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