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Master of HVAC: The Ultimate Heating & Cooling Maintenance Quiz
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What does a flashing red light on a modern furnace control board typically indicate?
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Hint
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⚖️
50-50
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Audience
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A
The furnace is running at maximum efficiency
B
A diagnostic error code indicating a system fault
C
The air filter is perfectly clean
D
The thermostat battery is fully charged
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