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HVAC
NATE Core & Service Certification
Gas Heating Systems
Knowledge Check
Gas Heating Systems
Knowledge Check
Knowledge Check
1 / 24
What symptom strongly suggests a cracked heat exchanger during furnace operation?
A
The blower motor draws higher than rated amperage
B
The flame visibly distorts or rolls toward the blower when the blower starts
C
The furnace short cycles due to low gas pressure
D
Flue gases rise above 600 degrees F on the stack thermometer
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