Combo-pac hot water air handler

[jddunning]

I have no heat coming from the combo-pac, the fan runs and the hot water tank is working but it doesn't blow heat! HELP?

[Admin]

I'm not sure what model you're working on.  It sounds like you have hot water coming from the tap.  Are you running the fan continuously, or is it starting when you call for heat?

If the fan isn't starting on a call for heat, and only running when you turn the thermostat to FAN ON, you may have a bad thermostat.  Test 24V at W.  Or you may have a faulty board that is not energizing the circulation pump or fan. Check if the circulation pump is running, if so you may have a check valve that is stuck closed.

[walker]

check that the isolation shut off valves for the heat loop aren't closed.