Peerless No Circulation / Air-Bound System

The boiler runs but radiators or baseboards remain cold.

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.

Possible Causes

Air trapped in piping, failed circulator pump, closed zone valves, clogged strainer

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 it is not running, check power and replace if it has failed.
Verify zone valves: Ensure zone valves are opening when thermostats call for heat. Manually open them 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.

Medium 3/5

System circulator pump

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