E07
Weishaupt
Fan Motor / Fan Control Fault
Boiler locks out with E07, fan does not start, no pre-purge.
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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
Failed fan motor on Weishaupt burner, Faulty fan capacitor (on single-phase fans), Loose electrical connections to fan, Defective fan relay on control board
How to Fix / Troubleshooting
Safety first: Isolate power before working on the fan or control wiring.
- Check power to fan: With a multimeter and the boiler calling for heat, verify if 230 V (or specified voltage) is present at the fan terminals. Only a qualified person should perform live tests.
- Inspect wiring and plug: Ensure the fan connector is fully seated and that wires are not burnt or damaged.
- Check fan rotation: With power off, spin the fan impeller by hand. It should rotate freely without scraping. If stiff or seized, the fan must be replaced.
- Replace capacitor (if fitted): On some Weishaupt fans, a run capacitor is mounted nearby. If the fan hums but does not start, the capacitor may be faulty. Replace with the exact µF rating specified.
When to call a professional: If there is no voltage at the fan or if the control board relay is suspected, contact an authorised technician.
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Repair Difficulty
Hard
4/5
Required Part
Fan Motor Assembly
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