NATE HEAT PUMP CERTIFICATION SCRIPT
2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS
◉What is the effect of a low charge on the switchover operations of
a reversing valve? Answer: Reversing valves are less likely to
transfer if charge is low.
◉A technician is working on a heat pump with a capacitor start-
capacitor run compressor. On initial startup, the compressor hums
momentarily and the shuts down on internal overload. What is the
problem? Answer: Too great a pressure difference on the
compressor.
◉A step down transformer has a rating of 40 VA. Its primary voltage
is 120V with a secondary voltage of 24V. What is the maximum
current draw of a load connected to this transformer? Answer:
1.7amps
◉What does a bright red or orange glow from the resistance
element in a duct heater indicate? Answer: Flow of air is insufficient.
,◉What does the outdoor fan do during defrost on a heat pump and
why? Answer: The fan stops to minimize defrost time.
◉What do bent vanes on a direct drive blower wheel in an air
handler cause? Answer: Loss in air flow, excessive motor wear, and
increased noise.
◉A split system heat pump is using thermostatic expansion valves.
The system performs properly in heating but in cooling the
compressor pumps down. What could this mean? Answer: The
power element of the indoor expansion valve has lost its charge.
◉What condition can cause a reduction from design capacity in a
heat pump? Answer: Undersized vapor line.
◉What is the result of excessive liquid line length or lift? Answer:
Flash gas.
◉What symptom could a technician expect on a heat pump system
in the cooling mode if the check valve is leaking internally? Answer:
Flooding of the indoor coil.
◉Voltage across a closed contact in a 24V control circuit could
indicate what? Answer: Pitted or dirty contacts.
, ◉What two checks typically made first on an electronic control?
Answer: Proper input voltage and proper output voltage.
◉In a low voltage circuit, what does a corroded wire-to-terminal
connection acts like? Answer: An additional resistor.
◉How should you test the continuity of a fuse? Answer: Power off,
fuse removed
◉What is the first check made for most electrical troubleshooting?
Answer: Voltage check of the supply line.
◉The following conditions exist in a circuit that supplies power to
three parallel loads.
One load is resistive
One load is capacitive
One load is inductive
How do you find the total current? Answer: The sum of the currents
through each load.
2026 COMPLETE QUESTIONS AND
CORRECT ANSWERS
◉What is the effect of a low charge on the switchover operations of
a reversing valve? Answer: Reversing valves are less likely to
transfer if charge is low.
◉A technician is working on a heat pump with a capacitor start-
capacitor run compressor. On initial startup, the compressor hums
momentarily and the shuts down on internal overload. What is the
problem? Answer: Too great a pressure difference on the
compressor.
◉A step down transformer has a rating of 40 VA. Its primary voltage
is 120V with a secondary voltage of 24V. What is the maximum
current draw of a load connected to this transformer? Answer:
1.7amps
◉What does a bright red or orange glow from the resistance
element in a duct heater indicate? Answer: Flow of air is insufficient.
,◉What does the outdoor fan do during defrost on a heat pump and
why? Answer: The fan stops to minimize defrost time.
◉What do bent vanes on a direct drive blower wheel in an air
handler cause? Answer: Loss in air flow, excessive motor wear, and
increased noise.
◉A split system heat pump is using thermostatic expansion valves.
The system performs properly in heating but in cooling the
compressor pumps down. What could this mean? Answer: The
power element of the indoor expansion valve has lost its charge.
◉What condition can cause a reduction from design capacity in a
heat pump? Answer: Undersized vapor line.
◉What is the result of excessive liquid line length or lift? Answer:
Flash gas.
◉What symptom could a technician expect on a heat pump system
in the cooling mode if the check valve is leaking internally? Answer:
Flooding of the indoor coil.
◉Voltage across a closed contact in a 24V control circuit could
indicate what? Answer: Pitted or dirty contacts.
, ◉What two checks typically made first on an electronic control?
Answer: Proper input voltage and proper output voltage.
◉In a low voltage circuit, what does a corroded wire-to-terminal
connection acts like? Answer: An additional resistor.
◉How should you test the continuity of a fuse? Answer: Power off,
fuse removed
◉What is the first check made for most electrical troubleshooting?
Answer: Voltage check of the supply line.
◉The following conditions exist in a circuit that supplies power to
three parallel loads.
One load is resistive
One load is capacitive
One load is inductive
How do you find the total current? Answer: The sum of the currents
through each load.
