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Re: Why isn't outdoor temperature displayed?
Try repeating the initial set up procedure. Remove all batteries from outdoor and indoor units. Install known-good batteries in the outdoor unit. Allow time for the outdoor unit to begin transmitting data. Install known-good batteries in the indoor unit. You should see the outdoor temperature displayed.
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Indoor (32°-122°F/0°-50°C) and outdoor (-4°-140°F/-20°-60°C) temperatures. Lower outdoor temperatures achievable with lithium batteries; Indoor and outdoor humidity. Includes temperature and humidity trend indicators; Daily min/max recall for temperature and humidity. Features a calendar and clock with alarm; The wireless remote sensor transmits up to 200 ft. The base station and wireless remote require 2 AAA batteries each, not include. If you want essay related topic you can go for custom essay writing service will get better result.
Make your way indoors at a leisurely pace. This allows the outdoor unit to initialize and begin sending data
Install batteries in indoor unit. You should see outdoor temperature displayed
In cold weather, the outdoor temperature display may disappear due to frozen batteries. At the moment my reading is - - because it is around 40 deg. F. However, in a day or two when the outdoor temperature reaches 50 deg., the outdoor temperature will be displayed again. All in all, rather whimsical.
Remove all batteries, both outdoor and indoor. Install batteries in outdoor unit and wait for it to begin sending a temperature signal. Install batteries in indoor unit. You should see outdoor temperature displayed. If not, batteries, transmitter, or indoor unit may be defective.
According to instructions for similar systems, you have to replace batteries in the outdoor unit first, then the indoor unit and wait 10 minutes without pressing any buttons for the indoor unit to begin displaying the outdoor temperature.
E221 is an indication that the out side temperature sensor is faulty,
this could mean it's open circuit (no resistance) sensing temperature or could be it has came loose on outdoor pcb (circuit board The E242 refers to a fault code, test temperature sensor and replace and you should be problem solved
see photos attached for help in testing the sensor