Feeling the solenoid valve hot to the touch? You're not alone.
Yes, it's normal for solenoid valves to heat up during operation, especially under continuous use.
The first time I noticed the heat, I thought it meant something was broken. Turns out, heat is part of how solenoids work. But how hot is too hot?
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Why do solenoid valves get hot in the first place?
Ever touched a running solenoid and felt it's warm or even hot?
Heat is generated because the solenoid coil consumes electrical power, which partly turns into heat energy.
Heat is part of the electromagnetic process
When current flows through the coil, it generates a magnetic field to move the valve. But not all electrical energy converts to magnetic force—some becomes heat.
| Factor | Description |
|---|---|
| Coil Resistance | More resistance = more heat |
| Duty Cycle | Continuous use builds up more heat |
| Ambient Temp | High surroundings raise operating heat |
| Ventilation | Poor airflow traps heat inside |
For most standard 12V or 24V DC solenoids in refrigeration systems, surface temperatures of 50-70°C are common. But if it feels too hot to touch comfortably, a thermal check is wise.
When should I worry about a solenoid being too hot?
Not all heat is harmless. So when is it a red flag?
If your solenoid gets above 80°C consistently, it may be at risk of damage or failure.
Use these signs as warning flags
- Burning smell or discoloration around the coil casing
- Frequent system shutdowns due to overheating
- Erratic valve function under high temperatures
If you notice these, stop and inspect. Overheating often signals poor power supply, wrong voltage, or a failing coil.
What can I do to reduce solenoid heating?
Want to keep things cooler and safer?
Use the correct voltage, ensure good airflow, and choose solenoids with lower power consumption.
Simple ways to stay cool
- Check your voltage — running a 12V coil on 24V? That will overheat it.
- Improve ventilation — allow airflow or add a small fan near the valve.
- Choose better coils — high-efficiency coils reduce wasted heat.
Using aftermarket coils with better insulation and lower amp draw is a cost-effective solution many of our customers prefer.
Conclusion
Yes, solenoid valves get hot—but too much heat signals a problem.
