The "Ef" message indicates an error with the Fins sensor, and the "Er" message indicates an error with the Room sensor.
- First, unplug and replug the sensor several times, wiping off the tip of the plug each time. On a brand new CoolBot, sometimes a little bit of waterproofing material we use can get into the port. On older units, there could be a little dirt on the prong.
- If that does not resolve the error message, don't panic. You should have about 2+ weeks before you get into real trouble. The CoolBot catches problems earlier than they become REAL problems, and uses the Er or Ef messages as a warning. Here's what you should do.
- If your CoolBot is within the 1 year warranty period, email firstname.lastname@example.org with your NAME, ADDRESS, PURCHASE DATE and we'll send you a replacement sensor.
- If you are out of warranty -- Buy a replacement sensor. The replacement sensor can as either a Fins sensor or Room sensor.
ALSO: There is an easy short term fix to keep your cooler running while you are waiting for a new sensor, and stop any ice ups that might be happening:
** If you want to be below 45F(7.2C), then use THESE short term instructions:
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:
- Discard the bad sensor.
- Change the FIN setting up 1-2 points from whatever you had it at before.
- Use the ROOM sensor on the CoolBot as the FIN sensor (they are the same, and the CoolBot runs better with no ROOM sensor than a damaged FIN sensor). That means unplug the Room sensor from the ROOM port... and plug it into the FINS port, and then gently insert the tip end of that sensor into the Fins of your air conditioner, in the same spot you had the previous (now broken) Fin sensor
- Set the temperature on the CoolBot to 33F -- it won't actually get that cold, but it will tell the CoolBot you are running in a safety mode and you want it to get as cold as possible without freezing up (which will probably be around 37-38F).
- You'll see an "ER" in the display of the CoolBot now, but just ignore it...
- Order a new sensor here.
*When you get the replacement sensor, use that one as a FIN sensor and go back to using the room sensor as the room sensor... and don't forget to change the FIN setting back down one or two clicks to whatever you had it before this problem.
** If you want to be at 45F(7.2C) or above, just remove the FIN sensor and change the heater delay setting to "d3". Use the right arrow to navigate to the Heater field (it should say F or C and the LED light will be on over Heater). Then press the check mark 3 times and it should say "d1". Press the right arrow to change it to "d3" and press the check mark to set it into memory.