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Direct Answer

If your boiler pressure keeps dropping, it may be due to a leak in the system, a faulty pressure relief valve, or a problem with the expansion tank.

Likely Causes

The most common causes of dropping boiler pressure include leaks in the boiler or piping, a faulty pressure relief valve, a malfunctioning expansion tank, or a problem with the boiler’s filling loop.

Safe Checks

Homeowners can perform a few safe checks to help identify the issue, such as inspecting the boiler and piping for signs of leaks, checking the pressure relief valve, and looking for any blockages in the expansion tank.

Danger Signs

If you notice any of the following danger signs, turn off the boiler immediately and contact a licensed technician: a gas smell, suspected carbon monoxide, smoke, sparking, melted wiring, flame rollout, or severe overheating.

When to Call a Technician

If you’re unsure about how to fix the issue or if you’ve performed the safe checks and still can’t find the problem, it’s time to call a licensed technician to diagnose and repair the boiler.

Prevention

To prevent the issue from happening again in the future, make sure to perform regular maintenance on the boiler, including checking the pressure relief valve and expansion tank, and inspecting the boiler and piping for signs of leaks.

Final Takeaway

By following these tips and performing regular maintenance, you can help prevent the issue of dropping boiler pressure and ensure your heating system runs safely and efficiently.