Somewhat similar to the problem posed by nikibooks this past January (most recent post March 2), we hear a loud singular banging sound that may happen frequently or infrequently on any day. Original installer who has also performed regular maintenance (system about 6 - 8 years old) has been here to troubleshoot. It didn't make noise then, but he heard it on a short video I managed to get lucky.
He released some air (valve on top of main unit, I believe) and poked around, but I don't know everything he did. Noise did not occur while he was here, although we tried to force it by turning up heat in each of the 3 zones. Noise continued after he left, so a few days later by text he suggested I turn down the pump (associated with domestic hot water) from hi to low (3 to 1). Two days since I did that, there does seem to be an overall reduction in frequency of the noise, but it's hard to say for sure. I've heard it twice in a few hours today, which is less than I typically would hear it for the amount of time I've been in close enough proximity to do so.
In the nikibooks thread, someone mentioned possible blocked vent. Our 4" (outside measure) white plastic vent goes out the side of the house and easy to access. Following what looked like normal exhaust, I looked inside with a flashlight and did not see any blockages. I did see some moisture along the inside of the pipe and a small drip outside. I presume that is normal. It's on the north side of the house so no direct sun, I live in southcentral Alaska, it's a nice day in upper 20sF right now.
Unless the opportunity to post pics comes up when I hit "post discussion", I don't see how to do so. Other than that, I'm wondering if someone might have suggestions about this "banging" issue. Thanks.
He released some air (valve on top of main unit, I believe) and poked around, but I don't know everything he did. Noise did not occur while he was here, although we tried to force it by turning up heat in each of the 3 zones. Noise continued after he left, so a few days later by text he suggested I turn down the pump (associated with domestic hot water) from hi to low (3 to 1). Two days since I did that, there does seem to be an overall reduction in frequency of the noise, but it's hard to say for sure. I've heard it twice in a few hours today, which is less than I typically would hear it for the amount of time I've been in close enough proximity to do so.
In the nikibooks thread, someone mentioned possible blocked vent. Our 4" (outside measure) white plastic vent goes out the side of the house and easy to access. Following what looked like normal exhaust, I looked inside with a flashlight and did not see any blockages. I did see some moisture along the inside of the pipe and a small drip outside. I presume that is normal. It's on the north side of the house so no direct sun, I live in southcentral Alaska, it's a nice day in upper 20sF right now.
Unless the opportunity to post pics comes up when I hit "post discussion", I don't see how to do so. Other than that, I'm wondering if someone might have suggestions about this "banging" issue. Thanks.