E18
De Dietrich
Primary Pump Failure
Display shows pump error, unit overheats or shuts down with no circulation
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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 on De Dietrich primary circuit, Airlocked pump, Electrical failure of pump motor, Blocked impeller due to debris
How to Fix / Troubleshooting
Safety first: Turn off power and allow the system to cool before touching the pump.
Step-by-step checks:
- Bleed the pump: Some pumps have a central screw. Place a cloth underneath, loosen the screw slightly to release trapped air and check if the shaft turns. Tighten securely afterward.
- Check valves: Ensure isolation valves around the pump are open.
- Listen for operation: Restore power and call for heat; listen for the pump running. If it hums but does not turn, it may be seized.
When to call a professional: Pump replacement or full system bleeding should be carried out by a heating engineer.
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Repair Difficulty
Hard
4/5
Required Part
Primary Circulation Pump
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