8
Hormann
Control Board Supply Voltage Error
Display shows “8”, operator dead or erratic after power surge
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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
Mains overvoltage or brownout, Blown control board fuse, Failed low‑voltage power supply on PCB, Incorrect mains voltage selection
How to Fix / Troubleshooting
Safety first: Turn off the circuit breaker and verify absence of voltage before opening the operator.
Step-by-step:
- Check mains supply: Confirm correct voltage at the operator input (e.g. 230 V AC in EU) using a multimeter if you are qualified. Otherwise, have an electrician check.
- Inspect fuses: Many Hormann control boards have a small glass or blade fuse. Replace only with the same rating and type if blown.
- Look for surge damage: Burn marks, swollen capacitors or a burnt smell indicate PCB damage. In this case, the board must be replaced; do not attempt component‑level repair unless you are an electronics specialist.
- Reset: After fuse replacement, restore power and test. If the error remains, replace the complete control board.
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Repair Difficulty
Hard
4/5
Required Part
Hormann Main Control Board / Power Supply Section
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