Peerless
No Circulation / Air-Bound System
Boiler runs but radiators or baseboards stay cold
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Air trapped in piping, failed circulator pump, closed zone valves, clogged strainer
How to Fix / Troubleshooting
Safety first: System water can be hot. Allow cooling where possible and use gloves.
Steps:
- Check circulator: During a call for heat, feel the Peerless circulator pump. If not running, check power and replace if failed.
- Verify zone valves: Ensure zone valves are opening when thermostats call. Manually open to test flow.
- Bleed air: Use bleed valves on radiators and high points to release trapped air until water flows steadily.
- Clean strainer: If a system strainer is installed near the boiler, isolate and clean it to restore flow.
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Repair Difficulty
Medium
3/5
Required Part
System circulator pump
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