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Why do My Radiators Keep Filling Up With Air?

Your radiator may be filling up with air if there’s a hydrogen buildup in the system or if you’re noticing continuous small leaks (these can allow air to seep in). Removing air locks from your radiator can be fairly straightforward, but if you find your radiators keep filling up with air more often than not, it’s time to get a professional to diagnose the problem.

A Heated Issue

When you switch off your AC and turn on your heating system as fall and winter arrive, there’s a chance air could slip into your heating system and cause an initial blockage. This is an easy fix you can take care of on your own. If your radiator makes a habit of filling up with air, it may be due to more than just a transition to your heating system.

Your radiator may be collecting air if:

  • You’ve installed the pump above the supply tank

  • There’s an open tank in the loft used for immersion heaters

  • There’s a buildup of hydrogen due to rusty pipes or sludge

  • There are consistent small leaks that allow air to enter

Not sure what’s to blame? No need to dwell too much on it, just call an HVAC professional. This may be something we can help you fix over the phone — connect with one of our Remote Assist experts for a free diagnosis and personal virtual guidance!

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We'll diagnose your issue over call or video and virtually walk you through the repair — all for free if you're a new customer! .

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