My indoor outdoor thermometer does not display the outdoor temperature

Try cleaning the outdoor thermometer transmitter unit by opening it up enough to spray compressed air (Ultra Duster or similar) on the temperature sensor. It fixed the hh.h error for me.

http://www.datasheet.tomkii.net/instructions/Thermor/BW972.pdf

INSTRUCTION MANUAL

Yes. Took awhile to find it, but here is the link: https://docs.google.com/gview?url=http://www.weatherconnection.com/manuals/91756.pdf&chrome=true

how do i set my clock for accurite 00604RX

Double check the batteries to make sure they are installed correctly. If one of the batteries in the outdoor sending unit is in backwards, it will not send the outdoor data. On the indoor unit, there is typically one battery that is used for receiving the signal from the outdoor unit. If all of the batteries are in correctly but that one, you will see the display and the indoor temperature information, but the outdoor information will not be displayed. If there are reset buttons, also try them.

I have a BIOS wireless indoor/outdoor thermometer. The indoor base unit doesn't display the outdoor temperature - it is blank - however the other temperatures - humidity, indoor temp, etc., are displayed, What is the problem? We have misplaced the manual so we don't know what to do.

It depends on the indoor and outdoor temperature and humidity. The low side pressure can be in the area of 135# to 145# with an indoor temperature of 80° and 50% relative humidity, and the outdoor pressure can be in the area of 300# to 330# on a 95° day depending on effeciency rating.
If your asking this to charge your a/c this is not how to charge your a/c.
Charging AC by superheat and subcool
First charging a unit by superheat, this is only for Acs with an orifice or capillary tube.
Optimum superheat is 12° to 15° at the compressor or suction line outside the unit.
Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
Charging by Subcooling, this is for Acs with a thermostatic expansion valve, it’s common to see a sight glass on the liquid line (on these units with a sight glass just clear it, when, indoor room is at approximate set point of the thermostat). Optimum sub cooling is 12° to 15° at the outdoor unit.
Hook up your gages and put a thermometer on liquid line (small line), start the AC. Measure the temperature of the liquid line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant,(you can also use a temperature pressure chart), now read the thermometer, let’s say the liquid temperature( the thermometer) is 100° and the saturation temperature (the gages or temp. press. Chart), is 114°, subtract the liquid temperature from the saturation temperature, 114°- 100° = 14° subcool.