One of the neatest features about the house we just bought is the recirculating hot water system. The two bathrooms are quite far from the water heater, and it has been awesome to turn on the tap and get nearly instant hot water. That is, until it stopped working yesterday. All of a sudden, the hot water is not instant. Here is the system we have:
According to the previous owner, the pump is just one year old. I can put my hand on the pump and feel the motor running. The whole unit is hot, but that doesn't seem surprising, considering it's on top of the water heater and attached to the outflow line. The only thing I can think of that might have caused things to stop working is the fact that I turned off the water supply to the house yesterday to replace a bathroom faucet. (The cold water valve under the sink in that bathroom is frozen open, so it was easier to simply shut off the whole house.) I didn't think to turn off the pump when I shut off the water. Is there a chance that the pump burned up trying to pump with no water pressure?
Any other ideas what might be wrong?