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NATE Gas Heating Service (Air) Exam (Latest Update 2026 / 2027) Questions and Verified Answers | 100% Correct | Grade A
Question:
How should a limit safe check be performed on a gas furnace
Answer:
Jump out the control for at least 10 min
Question:
How is an induced draft pressure switch tested for proper operation
Answer:
De energize the draft inductor motor and test the switch with a nanometer
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Question:
Which of the following are input signals to a high efficiency furnace control board
Answer:
The pressure switch, the pilot valve and limit valve
Question:
Which of the following are output signals from a high efficiency furnace control board
Answer:
The thermostat, main gas valve, and igniter
Question:
Where should high efficiency condensing furnaces get their combustion air from
Answer:
From outside of the home only
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Question:
Which of the following is not a cause of insufficient or low gas input
Answer:
A plugged orifice
Question:
A customer complains that there is not enough supply air coming through the registers Tech A checked the unit temp rise inspected the air filter and adjusted a loose fan belt
Tech B inspected the air filter observed the blower motor operation checked for duct obstructions and made sure that balancing dampers are in the correct position
Answer:
Tech B
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Question:
Tech A was called because not enough heat was being generated at the furnace The tech checked the heat exchanger and flue pipe and burners. He also tested inlet and outlet gas pressure to the furnace. His measurement was 4" WC to the main gas valve and 2" WC out of the gas valve
Answer:
A faulty gas valve
Question:
Which of the following would not be a cause of a faulty thermostat on a standing pilot furnace
Answer:
The furnace is short cycling
Question:
A new high-efficiency furnace has been installed, and the furnace seems to come on too often. Which of the following would most likely be the problem?
Answer:
Improper selection made of the dip
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