Evaporator fan runs all the time - Amana ATB1935HR Top Freezer Refrigerator

Question edited for clarity, MAKER.
Question moved to Model Category.

Your fridge freezer has three fans.

The compressor evaporator fan cuts in and out as required to maintain temperature.

The fridge evaporator circulation fan runs to maintain an even temperature. It stops when to open the door and resumes when you close it and stops when the set temperature is reached as long as the compressor isn't running. If the compressor is running, the fan normally runs to prevent icing which happens slowly.

The freezer also has a fan, and that runs pretty much all the time unless target temperature is met and the compressor is not running. This fan runs when you open the door to stop the moist air from the room freezing on contact to the 0'F, -18'C evaporator fins. The fan keeps the air moving to deposit less frost.

It sounds like your is running normally except for the noise. Trace the noise and find it. The compressor fan has a Shark Paper fibre board cover and these often distort over time and touch the fan blades. That is the common cause. The less common cause is the internal fans pinging off built up ice that should have been removed during the defrost cycle.

Evaporator fans must be running at same time as condenser fan. Check schematic to locate source of problem Is power reaching the motor?

There is an overheat klixon on the evaporator that stops the fan running until the coil gets below -11c This can take some time after startup. if the freezer runs more than an hour before the fan starting, check the klixon isn't faulty, and you have power to the fan. Also check the condenser grille is nice and clean as it will slow down the freezing process.

If the unit is running all the time and is not freezing everything then open the back fiberboard panel and clean out the coils in the back. Check to make sure the condenser cooling fan is running also. If the compressor is running and the condenser fan is not running there is a problem with the condenser fan. The compressor, condenser and evaporator fans all should be running at the same time. the condenser fan can be stuck... have dry bearings... of simply has failed. Before removing the back cover... touch the chassis were the doors close... it should be warm but not VERY warm to the touch. If it is VERY warm to the touch... for sure you have a problem with the condensor fan.

Since you did not say anything other than the fridge is working whit out stop, I have to assume at this point that the evaporator fan is running in the freezer compartment just fine.

I really need to know:
1. Is there ice in the back of the freezer compartment?
2. Is the evaporator fan running?
3. Is the condenser fan running?
4. Are the condenser coils clean?

One of the above has a problem... you just need to identify which one.

Thanks for choosing FixYa,
Kelly

the evaporator fan has stopped. it is usually in the back of the freezing compartment behind all the plastic. when the fan stops no air can circulate over the cooling coils so even though the compressor is running no cold can move iside the freezer or fridge. be extra careful when you take the small screws out as the screw heads can be full of build up that makes it hard to get a good hold of them. take your time and clean off all the screw heads so they don't strip out. The evaporator fan is not to expensive wait to buy on until you get the old one out.

There may be damaged or broken wire to the evaporator fan
There are two wires to the evaporator, one hot and one neutral Unplug and check the neutral against ground with a continuity tester if ok test the other wire in a non invasive fashion using a safety pin

The way you do is to insert the pin say at several points on the wire until you discover where the break is. Use alligator clips, one is to be connected at the connector of the fan hot wire ( The suspected wire that may be broken) With alligator connected at the end of the wire connector, insert the pin at different points to check wire integrity with an ohmmeter. Where there is no continuity, that is where the break would be.

If that does not work, you probably will have to run a new wire. Here is a hint: The evaporator fan runs only when the compressor is running. If you can extrapolate, you can find an alternate way to reconnect the evaporator fan and have your fridge running in no time.

I believe that because defrost is done by the mother control board this is why this is happening the part of the board that controls defrost is malfunctioning and the only way to resolve the problem is to replace the mother board part number WR55X10656 You can find the replacement board at these places below. Sea Breeze

http://appliancepartsse.blogspot.com/

http://appliancepartsse.blogspot.com/

I don't know why there would be much of a delay between the condenser and evaporator fans coming on. If you have diagnosed it as a bad motor, that's probably correct.

But the motor could just need cleaning and lubricating

Only the fan at the compressor turns on and off with the compressor cycle. The evaporator fan runs steady to maintain air circulation and temperature balance and to affect evaporator defrost in the off cycle. Sometimes the condenser fan will run continuously to assist in the evaporation of condensed moisture from the evaporator drainage.

mine runs all the time.