Why the vent valve solenoid control circuit shows constant volts on both wires when connected?

Answer 1

When a vent valve solenoid control circuit shows constant volts on both wires when connected, it could indicate a short circuit or a malfunction in the solenoid itself, causing both wires to read the same voltage. Additionally, if the solenoid is stuck in a closed position or if there's a wiring issue, it might not allow for a proper voltage differential, leading to identical voltage readings. It's also possible that the control module is providing a constant voltage signal, rather than a pulsed or switched signal, which is typical for solenoid operation. Checking the circuit for continuity and inspecting the solenoid for faults would help diagnose the issue.