Our house has hot water baseboard heating, driven by a natural gas furnace. There are 3 zones and 1 circulating pump. I have been noticing when the furnace kicks in, it is mixed in with short off intervals (about a minute). However, the circulating pump will be running the entire time.
I have adjusted the swing setting on all 3 thermostats to the maximum, but still the same. Is this normal behavior or are we looking at costly repair soon? Thanks.