Fujitsu Heat Pumps cause weird sound in breaker box and exhaust fan
Weird issue I’m experiencing and this obviously isn’t an electrical forum but I wondered if there was enough mini split installations here that someone else may have experienced this…
The weather is turning warmer in Zone 4A so I am turning out my Fujitsu mini split heat pump A/C for the first time since our house has been under construction, and I noticed a weird sound coming from my whispergreen bath fan. It is hard to describe, but it is like an electrical hum similar to a flourescent light ballast. The sound gets louder when you actually turn the fan on.
At first I thought it was a problem with the fan itself, but I checked the other whispergreen fans in the other bathrooms and they make the same noises. Then, I went down to the breaker panel and the same kind of sound is down there right where the electric comes into the panel.
The hum only occurs when the A/C is on. When the Fujitsu is running in fan only mode, there is no sound. My electrician is stumped. Could this be some interference of dirty electricity coming from the heat pump?
And just to be clear, this isn’t the hum/sound from the outdoor unit itself. This sound is showing up at the electrical panel and bath fans.
I know this is obviously an issue for a licensed electrician, but I was wondering if anyone here had this experience and if there was a known cause.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part