How to defrost upright freezer
My name s Peter. I am a retired field service technician.
1.) First, lets check your defrost timer. You will need a small flat head screw driver. Pull your freezer out to where you can get behind it. Do not unplug your freezer yet. There is a small white box almost 2" square. On this box is a small shaft with a slot in it. Turn this dial with your screw driver slowly until your unit shuts down (Compressor not running). What you have just done is force your unit into the defrost mode.
If the unit does not shut down you have a bad defrost timer. We are not done with the defrost timer yet.
Take a break, grab a cup of coffee, allow the unit 30 minutes to defrost.
Upon returning if the freezer has defrosted you have a bad defrost timer. Unplug the freezer and replace. Easy job.
2.) Ok, not the timer. Lets check the freezer drain. At times the freezer drain freezes up. When the unit goes into defrost the condensate can not go down the drain and you build up a wall of ice behind the bottom back wall.
Unplug the freezer. Pop the setting control knob off on the lower back panel. You may need a screw driver to wedge it off. Pull the seal strips out on the 2 sides. Unscrew all of the fasteners on the back panel cover. You can not remove the cover yet. You must disconnect the temperature control. There are different mountings. Perhaps 2 screws holding the control to the back cover or a connector where you need a small screw driver to wedge them apart.
Ok, you observe a wall of ice and have a frozen drain. Do not let the freezer defrost itself, you will have a flood. Using a hair dryer and a plastic spatula melt the ice and remove it in chunks. This is a long consuming task, take you time. Be careful not to touch any of the unit components. Let the hair dryer do the work on the evaporator coil etc. Clear the drain with hot water soak up as much as you can. We do not want this to happen again - lets make a heat sink. Taking a piece of 12-14 gauge wire about 3' long, strip about 2" off one end. You should wear gloves. The fins on the evaporator coil are razor sharp. Wrap the striped end of the wire around the defrost heater (Long black bar beneath the evaporator coil). Secure it tightly. Extend the other end of the wire to your drain hole. You want to cut the wire where you strip 2" of exposed bare wire into the drain hole. So, when your defrost heater is on any ice in the drain hole will be melted. Reassemble the back panel. Plug the unit in.
3.) Huh? None of these? Well then, you have to have either a bad defrost heater or bi-metal. Be careful of the evaporator coil is razor sharp. There are two connectors on each end of your defrost heater. These connectors pull apart, they are a little difficult at times. Please wear gloves. You need a multi-meter. Set the meter to the lowest Ohms (Omega Symbol). Touch the ends of the probes together, the meter should read 1.0. Insert one end of the probe into one end of the heater connector and the other probe into the other end. If the meter does not change the heater is bad. If you get a reading between 0-50 Ohms the heater is good.
4.) Not the heater!!!!! Your heater and Bi-metal work together. It is good practice when you replace one you should replace the other.
Your Bi-metal is a small canister looking item, silver color and clipped onto the tubing in the upper right hand corner. Disconnect and remove this item. Place the Bi-metal in a glass of water. Once again touch the 2 ends of the probe together, you should have a reading of 1.0. Using your meter put your probes in each side of the connector. If your meter reads '0' he Bi-Metal is good. When replacing the Bi-metal make sure it is in the original position. Make sure it is secure and not loose. You may have to bend the bottom clip to make sure it is tight.
Note: Everyone should have a multi-meter in there home. It has may uses and can save you a very expensive service call. So, next Christmas, Birthday Ect., buy your better have a multi-meter. They are not that expensive. That way you can borrow it.
Jan 03, 2014 |