I have 4 years old RHEEM unit, cooling OK but Evaperator blower never stop even I turned my thermostate to off and the condenser unit outside stopped but not the blower. I thinkk the electronic control board one of relay on it went bad but not sure? Any inputs for this
Troubleshooting will be appriciated.:confused:

You can check for a rubbed through or shorted wire going to your thermostat. You can use a meter to check your wiring for shorts but you will have to disconnect the wires to do so.
The next likely item is the furnace blower relay to check and replace. If the relay is on the circuit board you will more than likely have to replace the board.

Thanks very much hivac1000, I found a loosed wire on board and reseated it and working fine now. Tran