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NATE Gas Heating (Air) Exam ( Update 2026 / 2027) Study Guide Questions with Answers
Question:
Off delay timer in gas furnace
Answer:
Controls indoor blower off delay
Question:
Continuity check of de-energized relay coil
Answer:
Checked using ohmmeter
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Question:
Thermopile system
Answer:
Generates its own control circuit voltage of 750 mV
Question:
Single stage combination gas valve with thermocouple flame proving circuit
Answer:
Main burner gas flow is in series with pilot gas valve
Question:
Thermocouple pilot flame
Answer:
Should envelop 3/8 to 1/2 inch of thermocouple
Question:
Flame proving circuit on standing pilot gas furnace
Answer:
Pilot solenoid shuts off gas flow to main burner
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Question:
Intermittent pilot gas furnace
Answer:
Pilot is lit on every call for heat
Question:
First check for electrical troubleshooting
Answer:
Voltage check of supply line
Question:
Standing pilot furnace with relay for controlling supply blower
Answer:
Replace the relay to repair unit
Question:
Induced draft, intermittent pilot gas furnace
Answer:
Induced draft motor starts when thermostat calls for heat
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