ᐅ Problem with OMLOPP system beeping?

Objection! It might seem to work with the three connected lights at first glance. But this is not a good idea. A 20W transformer can only support a maximum of two 7.7W lights.

You must never exceed the power rating of a transformer. This is not just the maximum load, it is already an overload. The amount of overload hardly matters. Overload is overload. Always allow for some margin due to inrush currents and similar factors.

The flickering (or is it rather flashing?) happens because the transformer is most likely a switch-mode power supply, which interprets the high load as a short circuit and triggers its short-circuit protection.

If three lights of 7.7W each are still connected to a 20W transformer, the transformer will eventually fail from overheating. Until then, it will get very hot and burn out slowly. If only the transformer breaks, you have been very lucky that nothing worse happened. There is a reason why this power rating is given as the maximum.

This is a very common cause of electrical fires! And in this exact case, insurance will not cover the damage, as this is considered electrical fault or malpractice. A friend of mine had exactly this happen (same situation, but with recessed ceiling spots where someone just added one more light) and he is still dealing with the consequences.

So please, either
- use a suitable transformer (with reserve capacity)
- use as many of these transformers as needed, with a maximum of two lights per transformer
- use only two lights (= inconvenient)
- if this setup was sold as a complete set, return it entirely, because selling it like that would be irresponsible (I am not familiar with Omlopp)

But never connect two of these transformers in parallel on the output side to reach 40 watts. Each transformer must have its own independent secondary circuit. (That is the side of the transformer where the lights are connected)