E25
Weishaupt
Circulation Pump / Flow Fault
Boiler displays E25, pump fault or no flow detected through boiler.
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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, Air lock in pump or boiler, Blocked system filter, Faulty pump relay on Weishaupt control
How to Fix / Troubleshooting
Safety first: Turn off power and allow the system to cool before working on the pump.
- Check pump operation: With power on and a heat demand, touch the pump body with a screwdriver to feel for vibration. If silent, it may not be running.
- Free a stuck rotor: Many pumps have a central screw. With power off, remove the screw and gently turn the rotor with a screwdriver to free it. Replace the screw and test.
- Bleed air: Use the pump vent or nearby air vents to release trapped air.
- Inspect system filter: If a magnetic or Y-strainer filter is installed, isolate and clean it to restore flow.
When to call a professional: If the pump needs replacement or if the control is not energising the pump, contact a heating engineer.
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Repair Difficulty
Medium
3/5
Required Part
Circulation Pump
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