jevil

Hi all, recently I had a Mitsubishi Heavy Industries system 4 inverter installed. However, I found that during operation, I can hear a soft strange and slightly high pitched "eeeee" whistling sound. The sound can be heard more clearly when the room is quiet or when you are right under the air con unit. I concluded that it's not the fan noise as the whistling sound doesn't change or become louder or softer when I switch the fan speed to different levels. I'm not annoyed by the fan noise but rather the "eeeee" whistling sound that can be heard during operation. I tested it with all 4 units for my system 4 and all have the same "whistling" sound. I'm satisfied with the air con but the "whistling" sound can be rather annoying at times especially when you are trying to sleep. The previous air con i had (mitsubishi mr slim system 3), I don't recall hearing this strange sound during operation. Is this abnormal? Is it a problem with installation or the compressor/air con itself? anyone with mhi air con or have similar "probs" can feedback to me? Thanks! My compressor : scm80zg-s air con units : 3 x skm28zg-s 1 x skm50zg-s

Hi all, recently I had a Mitsubishi Heavy Industries system 4 inverter installed. However, I found that during operation, I can hear a soft strange and slightly high pitched "eeeee" whistling sound. The sound can be heard more clearly when the room is quiet or when you are right under the air con unit. I concluded that it's not the fan noise as the whistling sound doesn't change or become louder or softer when I switch the fan speed to different levels. I'm not annoyed by the fan noise but rather the "eeeee" whistling sound that can be heard during operation. I tested it with all 4 units for my system 4 and all have the same "whistling" sound. I'm satisfied with the air con but the "whistling" sound can be rather annoying at times especially when you are trying to sleep. The previous air con i had (mitsubishi mr slim system 3), I don't recall hearing this strange sound during operation. Is this abnormal? Is it a problem with installation or the compressor/air con itself? anyone with mhi air con or have similar "probs" can feedback to me? Thanks! My compressor : scm80zg-s air con units : 3 x skm28zg-s 1 x skm50zg-s