Who are you to say that a device that has passed the relevant tests and been EU marked is going to be faulty. The reason that the cheap ones are cheaper than the dearer ones is probaby because the dearer ones look smarter and are marketed by different companies to Aldi. And the cheap ones look horrible, but it doesn't stop them being effective.
You may have come across ad efective one, or more likely, your "false positive" was an accurate alarm, trigerred by something that may not have been your boiler. Was the alarm still beeping when you arrived?
You may have come across ad efective one, or more likely, your "false positive" was an accurate alarm, trigerred by something that may not have been your boiler. Was the alarm still beeping when you arrived?