3 Device defective within 4 weeks.

The device looks good and has a very good heat output, when is it going. We have 4 of these devices in our family in action. For 3 devices for a very short time the circuit breaker against overheating was broken.
Is this case occurred, the radiator has no function.

The first I can return it to the dealer. Exchange warranty went smoothly and quickly by equip. Kudos to the dealer (ETC-Shop). When 2nd defect I was referred to warranty processing at the service portal SLI24.de. This store is a disaster. After online registration of my defective radiator I got a confirmation that the order is recorded, then nothing happened more. On mail inquiries you get no answer, you can call there either.

At some point I had no desire for this service and have even taken me to the radiator chest. I have expanded the circuit breaker to prevent overheating and lo and behold, he now runs perfectly. The temperature controls the device via the external thermostat properly and thereby switches off too. I have this measure now carried out for all devices and all are now running without disruption.

A little tip: the matching circuit breakers there are, among other things for little money in a well-known auction house.