16
Merlin
Low Voltage or Power Supply Fault
Display shows code 16, opener will not move, faint clicking heard from inside unit.
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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
Faulty internal transformer, Blown low‑voltage fuse, Loose mains connection, Damaged power cord
How to Fix / Troubleshooting
Safety first: Mains voltage is dangerous. If you are not qualified, do not open the mains compartment; contact a licensed technician.
- Check outlet: Plug a lamp or tester into the same outlet to confirm power is present.
- Inspect power cord: Look for cuts, kinks, or burn marks on the Merlin opener's power lead. Replace if damaged.
- Internal fuse: Some Merlin models have an internal low‑voltage fuse on the PCB. With power disconnected, remove the cover and visually inspect the fuse. Replace only with the same rating if blown.
- Transformer test: Using a multimeter and with extreme caution, measure the AC voltage at the transformer secondary (per service manual). If no output is present, the transformer is faulty.
- Board replacement: If the transformer is integrated or the low‑voltage regulator on the PCB has failed, replace the control board assembly.
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Repair Difficulty
Professional Required
5/5
Required Part
Merlin Power Transformer
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