Lastly, the home-owner referred to as to report the return of the F4 error code. We raced over and confirmed from the info logger that energy had certainly dropped from 245 volts to 35 volts for half a second! Not lengthy sufficient to make the microwave blink 12:00 or trigger a pc to restart however lengthy sufficient for the management board voltage to drop.
Our senior tech assist man surmised that if the drop in voltage occurred when management board was making an attempt to learn refrigerant pressures, it could out of the blue see catastrophically low pressures and shut down.
This was as a result of every strain sensor was fed 5 volts DC after which despatched a return sign to the management board. If the strain was out of the blue fed 1 volt DC, the return sign to the management board would look like actually low refrigerant strain.
This was nice information to lastly discover a offender and have the ability to inform the home-owner that we knew why the fault was occurring.
After all, all they wished to know was: what had been we going to do about it?
Producer: Don’t Alter Something – Home-owner: Rip it Out!
Now that we knew that intermittent voltage dips had been inflicting the F4 error codes, we needed to discover a answer. The producer mentioned we should always relocate the system to a location the place there have been no dips in voltage. Ha! That wasn’t very useful right here.
The home-owner didn’t wish to proceed struggling with a system that was so delicate to incoming energy high quality. In the meantime, the producer mentioned we’d void the guarantee if we altered their tools.