1. Any ice must be MELTED completely before trying these steps. Ice melts fastest in the A/C's FAN ONLY mode, (if the fan is catching in the ice turn your AC OFF!!) or you can use a hair dryer or additional fan as well.
First let's look at a few easy potential solutions to your ice up:
- Make sure your air conditioner fan is on HIGH.
- Make sure your A/C is in COOL mode, not Energy Saver.
- Make sure the FILTERS are removed from in front of the air conditioner fins.
- Make sure your fins don't have lint on them! Lint causes ice. Even if it looks clean, if it's been over 2 weeks since you last cleaned your fins, this is PROBABLY your problem. See how to clean your fins here.
- Clean your fins every 1-2 weeks. Lint and an oily film can get trapped in the fins where you can't see them. Those things block air flow and reduce cold transfer, dust gives the condensation a place to stick and ice WILL form.
Dirty fins drastically decrease your cooling power and waste electricity! Clean them once every 1- 2 weeks. Use a brush with stiff plastic bristles that are 2" long to wipe down the fins. Rinse the brush in a pail of water after each swipe. Don't use soap. If your fins were knocked and have become “squished” the cooling power will be decreased - use your fingernails or a kitchen knife to straighten them
If it has been a very long time in between cleanings, they make a special foaming coil cleaner for air conditioners. It costs about $5-7 and is available at hardware stores. It can make a world of difference!
Restricted air flow can cause your AC to overheat and shut off. Regular cleaning will extend the life of the air conditioner.
2. Make sure the tip of the FIN/Frost SENSOR is in the right place. On new units it's the wire coming out the bottom under the word "FINS" on older units it the longer wire coming out of the top right side.
What's the right place?
- This sensor needs to be stuck INTO THE FINS of the air conditioner 1/4 inch. It can't be sitting next to the fins, in front of the fins, or pushed all the way through the fins. The tip needs to be inserted into the fins -- if you push too hard and it goes through the fins to the other side, then it will miss the ice that's forming.
- Be very careful when putting the sensors into the fins because sharp fins can slice the waterproof coating -- some fins even have micro-serrations on them! Use a screwdriver or even the tip of a pen to open up the fins, then gently put the sensor into the fins, then gently pinch the fins back around the sensor (so it doesn't fall out).
- The default spot on the FINS to place the sensor is between the bottom two cooling pipes in the center -- so that will be just about 1 inch from the bottom, and in the center of the fins. Start there, but see instruction#3 below!
After the ice melts, watch your a/c unit as it's cooling. Where does frost FIRST start to form? That's where your sensor tip needs to be.
Note for Mini-split users only: For a few mini-split air conditioners, the ice starts forming around the "top and back" of your wall unit. It's hard to notice that, but check if you have tried the other things and you are still getting ice up. It's difficult to move the fin sensor to the back, but it's important if yours is one of the minority units that do start to ice up in the back.
3. Check the calibration of the CoolBot sensors:
Gently slip the fins sensor out of the face of the air conditioner. If the sensor is frozen in the face of the air conditioner thaw the ice first. You can wait for it, or use a hair dryer but if you force it out it will break. Wait about 2 minutes for the fins sensor to register the air temp then using the arrow keys on the CoolBot click back and forth between the room and fins modes and compare the temperatures.
If the sensors read more than 3 degrees different then one is broken. Determine which one is bad and throw it away! One may be reading obviously wrong or you can compare the temperatures to another thermometer.
Set the CoolBot in the “workaround” mode and order a new sensor.
Workaround mode: The room and fins sensors on the CoolBot are interchangeable. We are going to determine which one is bad and only use the good one!
- Discard the bad sensor! If there is a secondary thermometer in the cooler check the temperatures against it. Unplug and throw away the bad one. Don’t get it mixed up and accidentally reuse it. It will always cause you problems.
- Plug the good sensor into the fins port. Gently insert the tip of the sensor tip into the fins of the AC, low and centered if it will reach but definitely not directly over a coolant tube (peek through the fins to locate the pipes)
Leave the room port on the CoolBot empty. The CoolBot will read “ER” but it has a really good algorithm for guessing the room temperature so it will continue to function almost normally, within just a few degrees of the set temperature, till you get a new sensor.
If the sensors are calibrated and if you're still getting ice on the fins:
Adjust your FIN setting:
- Press the RIGHT arrow button until the light behind the word FINS comes on.
- Now, press the CHECK button. The default is "1".
- Press the right arrow button to increase it to "2" or "3" or "4" and then press CHECK to burn it into memory.
- Allow some time between each adjustment to determine if the change is successful
Keep going up 1 point until the problem is solved. If you have to go up above "4" then skip to the next step, below.
On older CoolBots, to adjust your FROST setting: Press the FROST button. The default is "33". Keep going up 1 point until it's solved. If you have to go above "37", then skip to the next step, below.
4. If you've gone up to FIN=4 (or FROST=37 on older models) and you are still having trouble, you can adjust the heater setting, it's a forced delay that will give the air conditioner a bit more time to melt the ice. This is especially important for some brands of air conditioners OR if you are running LOW fan mode or ENERGY SAVER mode.
For NEW CoolBots, to adjust the hidden delay setting do the following:
- Use the RIGHT arrow to go to HEATER mode (the light under HEATER will be on and the display will read oF or oC if using a Celsius setting).
- Press the CHECK MARK 3 times or until you see "d0" or "d1" in the display. d0 is NO delay.
- Press the RIGHT arrow to increase the setting. Try "d2" or "d3", press the check mark to burn the setting into the CoolBot's memory. You shouldn't have to go up much higher than that. If you get above "d4" and it's still freezing you may have an air conditioner problem
*On older-style CoolBots, press the DELAY button and adjust it up to 2 min or higher.
5. The above 4 steps are going to solve things for 95% of you.
*If your AC is STILL icing up and you've raised both your FIN/Frost settings by 4+ points, then you need to contact us or an HVAC repair person, you may have a coolant leak or some other AC problem.