I have a Crown oil boiler and Crown megastor 40 gallon indirect water heater. The system has 3 zone valves but a single circulator (water heater is on zone 2).
Today we had only lukewarm water coming from the faucets. The zone valve for this zone is open, the boiler is working and there is pipe from the boiler to the water heater is hot. But the pipe coming from the water heater returning to the boiler does not get hot.
The other two zones are getting heat so the circulator seems to be working properly.
This problem has happened several times in the past few weeks and it seems to start working again for a while.
Has anyone had this type of problem? I appreciate any advice that you can offer to me.
Thank you in advance,