Chaffoteaux Short Cycling / Poor Heat Transfer

Furnace starts but shuts down after a few seconds, repeatedly cycling without heating the system properly.

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

Oversized furnace for system, Blocked or closed radiators, Pump speed too low, Air in system causing poor circulation

Safety: Allow system to cool before bleeding radiators.

Open radiators: Ensure enough radiators or heating circuits are open to absorb the furnace output. Fully open radiator valves in main rooms.
Bleed air: Bleed all radiators and any automatic air vents. Refill system pressure as needed.
Check pump settings: If the circulation pump has adjustable speeds, set it to a higher speed to improve flow (refer to the pump manual).
Check bypass: Ensure any automatic bypass valve is correctly set and not fully closed.

Medium 3/5

Primary Circulation Pump

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