A07
Brötje
Fan start failure / no air flow
Boiler shows A07, ignition sequence aborted, no fan pre-purge detected
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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
Fan motor failure, Loose fan connector, Faulty control board fan relay, Jammed fan wheel
How to Fix / Troubleshooting
Safety: Disconnect power before touching the fan or control board.
- 1. Visual inspection: Remove the front cover and locate the Brötje fan. Check the wiring harness and plug for secure connection and signs of overheating.
- 2. Check for mechanical blockage: Try to rotate the fan wheel gently by hand (with power off). It should spin freely. If stiff or blocked by debris, clean or replace the fan.
- 3. Electrical test: A technician should measure voltage at the fan terminals during a start command. If voltage is present but the fan does not run, replace the fan. If no voltage, suspect the control board or safety interlocks.
- 4. Control board inspection: Inspect the PCB for burnt tracks or damaged fan relay. Replacement of the main control board should be done only by authorised service.
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Repair Difficulty
Hard
4/5
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