When there is a start command but the solenoid valve does not open, we must determine if the problem is electrical, mechanical, or the result of an interlock.
Is there actually a command?
It must be verified if the correct voltage reaches the coil at the appropriate moment in the sequence. The absence of voltage usually indicates that a permissive or interlock has not been satisfied.
Coil check
An open, shorted, or overheated coil can prevent operation. This should be checked using a safe electrical procedure and in accordance with the manufacturer's specifications.
Mechanical sticking
Dirt, wear, or mechanical stress may prevent the mechanism from moving. The valve should not be struck or bypassed to force it open.
Pressure differential
Some valves have specific differential pressure limits for proper operation. Extreme conditions may affect opening.
Feedback
If an end switch is present, it must be checked if the mechanical position matches the electrical feedback. An incorrect signal can block the BMS.
Safety
Do not apply permanent voltage or bypass without an approved procedure. Gas valves are safety-critical components.
