Exhaust blower runs constantly - Rheem Packaged Gas And Electric Unit 13 Seer 3. Ton Ac 100000 Btu Gas

This could be due to either an open safety switch such as a rollout or high limit, or the relay could be welded inside the control board constantly sending 120 volts to the blower motor. A less common cause could be a bad thermostat which can be verified by removing the face plate. If the blower stops, then the thermostat will need to be replaced.

When you set your thermostat to auto, it will automatically shut off when it reaches the temperature you set it at. I personally set mine on auto because I don’t want it to run constantly. This will save you money on your gas or electric bill. The blower will run constantly if you set your thermostat in the on position.

Yes. There are two motors. There is a small motor on the inducer assembly that vents the exhaust and there is a larger motor that runs the blower

Dirty evaporator coil, dirty air filter, weak blower motor windings, weak blower motor capacitor, wrong blower speed, leaking or broken ductwork, uninsulated ductwork, gas valve pressure needs adjusting(low fire)? Might be any or all of the above.

It sounds like the exhaust is restricting the outlet gas. Try running it without the exhaust. If it runs better, clean or replace the exhaust /mufler.

you hit reset on thermostat or control module?

Hi,

If you're referring to the heater "FAN" running continuously, then its likely to be your blower motor resistor.

The heater blower motor (under the dash) has constant power supplied from the battery, but is controlled by the blower "resistor" - usually mounted on the blower motor assembly. If one or more of the blower resistor coil wires are faulty, the motor will either not work on one of the fan settings, or will constantly run by itself.

Your blower/ fan switch is open. This is a safety switch that will open if the unit get to hot usually around 220 deg. The switch is located near your indoor blower and has a manual reset. You will need to get this serviced as it is a safety feature on your unit and your heat will not turn on while it is tripped. A cracked heat exchanger could be the cause of the trip but usually its just a failed switch that needs replaced.

the Thermos coupling has gone bad, call the manufacture and talk to customer support.

No, the blower motor is supposed to run and dissipate most of the heat. It sounds like the blower motor isn't running.