I have a Bryant Heat Pump installed 6 years ago - had the coil replaced last year - it has suddenly starting making a chirping noise (sounds a bit like a cricket). The noise is not really constant but happen on and off all day and night. Could this be a sign of a problem or something that might be loose? I can't seem to determine the exact cause but it is coming from the bottom area of the unit where there are only the drains and wiring? Has anyone experienced this before? Thanks for any help!:confused:

No experience with this problem. You will need to take the unit apart or track down the noise on site at your location. It could be the sheet metal rubbing together from vibration or the blower assembly making noise.