Oregon Scientific RAR501A 4 Zone Temp and humidity sensor not working

Which model Oregon Scientific do you have? There are a couple that you need to set the time zone with a switch on the back of the unit. For the BAR388HGA-BK, you press and hold Mode for 2 seconds until it goes into the setting mode. Then you can use the up/down arrows to cycle through the Time Zone options. (1 is Pacific, 4 is Mountain). Press Mode again to confirm the setting and advance to the next item to change. You will leave the Set mode if you do not press a button for several seconds. If you just press and release the Mode button, then you can set the time display option.

A number of Oregon Scientific product manuals are available here:
Technical Support , http://www.oregonscientific.com/us/en/service/support . Scroll down and see the drop-down menu on the right.

I hope this helps.

Cindy Wells

As much as it sucks to do, you have to reset the base and the temperature sensor. When you do it, keep the temp sensor next to the base until the base recognizes it.

Hit MODE button. As soon as "PR" appears in lower right corner hit the " ^ " button. It wil scroll through PA, MO, CE and EA. Hit MODE again to scroll through hours, minutes, etc.

here you go a manual http://global.oregonscientific.com/manual/BAR686A.pdf

I have the same unit (IWA-80055) and after not finding anything helpful on the net, I just messed with it until I got it fixed. Here's what to do:

1. Take the cover off the back of the remote sensor.

2. Set the chanel to ch.1. (I tried all three but only ch.1 worked for me).

3. Use several tools. (i.e. a stick, needle, what ever you can but you need two) and hold down the reset button on both the sensor and the clock. (at the same time.)

If done right, it should only take a few seconds to start.

The outside temp is delayed at first. Be patient.

-Press SELECT once and time number should flash.
-Press and hold SELECT and it will enter settings mode for the clock.
-At the bottom of the screen next to the moon phase you should now see PST time zone.
-UP and DOWN keys will change the time zone.
-Press SELECT and other clock settings can be changed.

Two things...
1) press reset on the base unit
2) press and hold for 2-3 seconds the channel button

You should be in business

I've had a similar problem with another model, an Oregon Scientific Model IWA-80055 Wireless Thermo Clock, in which when I replaced the batteries in the remote sensor, the clock would not read the temperature from the remote sensor.
I found it fairly consistent to solve this by taking a battery out of place in the clock and putting it back in.  Unfortunately this also messed up the clock's time and date.  This is also in the instructions catalogue for the device, check and see if yours gives a similar solution.