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Académie
HVAC
NATE Hydronics Gas Service Specialty
Zone Valve Troubleshooting
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Zone Valve Troubleshooting
Vérification des connaissances
Vérification des connaissances
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A zone valve motor hums but the valve does not open. When the manual opening lever is used, the valve opens freely by hand. What is the most likely cause?
A
The valve body is corroded and the disc is stuck to the seat
B
The motor windings have failed and cannot generate enough torque to open the valve
C
The end switch is stuck closed, preventing the motor from receiving power
D
The thermostat is sending insufficient voltage to run the motor
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