Solenoid Valve Troubleshooting Guide

November 28

As we all know, any mechanical device has appeared some faults after long use. In this article, we will explore the quick troubleshooting steps for not working or faulty solenoid valves. Solenoids are mechanical devices, which means they will eventually fail. The problem needs to be fixed immediately when this happens. Fortunately, these devices only have a few components. A solenoid valve also works on a relatively simple mechanism. The result is that they are easily serviced. So let’s start the troubleshooting methods.


To prevent a solenoid valve from burning, switch off the power during servicing.

How To Fix Not Opening Solenoid Valve?

To fix the problem, determine which type of solenoid valve you have. The solenoid valve can be either normally open or normally closed.

Additionally, if it is a direct-acting or pilot-operated type. Depending on the type of valve, different causes can lead to the valve, not opening.

1) Coil Problem

Use a voltmeter to measure the voltage across the coil. This should help you determine whether the coil is functioning properly. To determine if there are magnetic forces acting on the coil, pull it slightly. When it is hard to pull, the coil creates a magnetic field, thus lasing current. It is necessary to replace a burnt coil.

2) Wrong Voltage

If the voltage is incorrect, make sure the supply matches the manufacturer’s specifications.

Different solenoids require different voltages. Depending on the solenoid valve, it can be either 12V or 24V, and an incorrect power supply may damage the circuitry and coil.

Solenoid valves also differ in their AC voltages. If you want to use a 110-120V solenoid valve, you must use a corresponding power supply. You might damage the valve if it gets above that level.

3) Pressure Differences

Different solenoid valves have different pressure specifications. Ensure the pressure across the ports does not exceed or fall below the levels specified by the manufacturer.

If the input pressure is too high, reduce it. The valves that work with pilots require a minimum pressure in order to function properly.

When the pressure of the system is too low for the valve, it may need to be replaced with one with an appropriate pressure requirement.

4) Damaged, Dirty Valve Seat Or Seal, And Missing Component

Make sure the affected part is clean so the dirt causing the jam can be removed. Replace any damaged items such as diaphragms for pilot solenoids. Install any missing components.

Also Read, Ball Valve and Intelligent Valve Design

How To Fix Solenoid Valve That Partially Opens?

A malfunction can be caused by inadequate pressure, damaged components such as the armature and tube, dirt on diaphragms, valve seats, or tubes, corrosion, or missing parts. There are various solutions depending on the affected part or type of fault.

1) Low Pressure

You should make sure the pressure stays within the manufacturer’s recommended range. Indirectly operated or pilot solenoid valves won’t open fully if proper pressure levels aren’t obtained.

2) Dirty, Corroded, Damaged, or Missing Parts

You should clean dirty diaphragms, seats, or tubes. Components that were broken or damaged were replaced.

In some cases, parts with corrosion will not perform as required. Also, install the missing components.

solenoid valves

solenoid valves

How To Fix Burnt Coil

Solenoid valves can burn the coil for a number of reasons. In addition, there are many issues such as incorrect voltage, short circuits, dirty or damaged moving parts like the plunger, as well as overheated media. The coils may have been burned because the wrong type was selected.

1) Incorrect Voltage

Ensure that the solenoid valve coil voltage is within the power supply’s specifications. The coil should be changed if it’s incompatible with the power source.

The voltage of solenoid valves varies by valve type and size. Make sure the one you install is suitable for your situation.

2) Short Circuit

Check the wiring of the solenoid valve. Make sure voltages are not fluctuating. If a wiring system or solenoid valve circuit has a fault, fix it as soon as possible.

Identify any fluid leaks in the valve that may have caused a short circuit. Short circuits caused by fluid or moisture are one of the main causes of solenoid valve problems.

3) Dirt or Bent Moving Parts

Make sure the tube and plunger assembly are clean. When the valve is operating, dust on these components could cause enormous friction and high temperatures. Whenever one of these parts breaks or bends, replace it.

4) High Medium or Surrounding Temperature

The valve may have to be replaced with a high-temperature tolerant type if the coil was burned out because of hot fluid. If temperatures are too high around the installation, think about dealing with it. The valve area can be ventilated, which would be another option.


Solenoid valves that are faulty cannot perform as expected. In the event of a faulty orifice, fluid may leak through the orifice because the medium is not properly regulated. Detecting and fixing solenoid valve problems can help avoid unwanted system breakdowns. Choose the solenoid valve manufacturer wisely, who can provide the parts if replacement is necessary.