E10
Ravenheat
Circulation Pump Fault / No Flow
Furnace shows E10 and stops, often when demand is high or multiple zones call for heat.
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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
Seized circulation pump, Airlock in pump or system, Closed isolation valves, Blocked system filter or sludge in pipework
How to Fix / Troubleshooting
Safety: Allow the system to cool. Isolate power before removing pump covers. Water may be hot and under pressure.
User checks:
- Listen for pump operation when the furnace calls for heat. A loud humming with no water movement suggests a seized pump.
- Ensure any visible isolation valves near the furnace are in the open position.
Technician checks:
- Bleed air from the pump via the bleed screw (if fitted) and check for free rotation of the pump shaft.
- Test electrical supply to the pump and measure current draw.
- Inspect and clean system filters and strainers.
- Power-flush or chemically clean the system if heavy sludge is present.
Persistent E10 usually requires pump replacement or system cleaning.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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