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The display on the indoor unit reads p3 what could be the possible fult

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More than likely depending model, if you are a dual or triple mini split, one unit is calling for cool and the other calling for heat at same time.

Posted on Nov 20, 2014

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1 Answer

Changed batteries and now cannot get an outdoor reading.how do I fix this?


  • Remove all batteries
  • Install batteries in outdoor unit
  • 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.

Jan 22, 2017 | Measuring Tools & Sensors

1 Answer

Hi I installed 2 in 1 cassette unit but it display p3 sign in indoor unit can u pls tell me how to solve the problem


You will have to note the make of the equipment you have there are thousands of different types of air con and that code could relate to any of them

Oct 08, 2016 | Heating & Cooling

1 Answer

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.

Feb 09, 2016 | AcuRite Acu-Rite 00621 Wireless Weather...

1 Answer

Will not transmit outdoor info. Batteries good- LED lights. Monitor shows indoor temp only.


There are a couple of possibilities for the failure to transmit/receive outdoor data. First, resynch the two units. This will depend on the manufacturer. For some brands, you need to take the batteries out of both the indoor and outdoor units for 10 minutes. Then put the batteries into the devices with both side by side (working inside is easier). Wait until the outdoor data is displayed. There are some weather station systems where the outdoor unit isn't weather-proof. You may need to dry the outdoor unit for several days after removing the batteries before resynching it to indoor sensor.

If the data displays properly when the outdoor unit is inside, you may have the outdoor sensor too far away from the indoor unit. (The distance will depend on the number of walls and the composition of the wall studs/siding.) Try keeping the two units closer together.

If the outdoor data isn't displayed when the two units are side by side and the reset procedure doesn't work. One device has an internal malfunction (transmitter or receiver failed). It's probably best to replace the unit. If it is under warranty, contact the manufacturer.

I hope this helps. For specific details on resetting the indoor and outdoor units to synch them, please add a comment with the make/model of your weather station.

Cindy Wells
(I've seen Davis Weather stations damaged by a close lightning strike. The outdoor unit had to be replaced.)

May 23, 2015 | Measuring Tools & Sensors

1 Answer

Front grill


Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.


Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.


Mar 18, 2014 | Fujitsu Heating & Cooling

1 Answer

Radio Shack 63-1090 indoor/outdoor temperature unit. Won't give outdoor readings. Temps are cold, -5F but it always worked before. Put in new batteries in the inside and outside units, wiped outdoor sensor...


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.

Dec 31, 2013 | Heating & Cooling

2 Answers

My jeep will start for approximately 3 seconds and then just turn off. I dont know what it is but i have been told that it was the crankshaft position sensor but i want to get another opinion. If this is...


oh please!!!! there are so many sensers on your jeep,, any one could cause this fult,,,,,
if its a sensor hook the jeep up to the computer and it will give you the fult coads its easy to fix it with them,,,,and you will be saving money,, if you just hook up a new sensor the computer will still see the old fult coad and may still not let the engine run right, so your running around in rings or nothing,,,get the coads read,

Nov 28, 2010 | 1999 Jeep Cherokee

1 Answer

I have a problem code...its says check EO


Signal transmitting/receiving
error
(Indoor controller does not
respond to remote controller
signal.)
During individual unit control
1) Bad contact of transmission
wire
2) Signal transmitting/receiving circuit
is abnormal.
1) Check the transmission wire.
2) Check with another remote controller. If "EO" is
still indicated, replace the indoor controller
board.
If other check code appears. replace the original
remote controller.
P3 Signal transmission error
(Remote controller does not
respond to indoor controller
signal.)
1) Bad contact of transmission
wire
2) Signal transmitting/receiving circuit
is abnormal.
3) Wrong operation due to noise
wave emitted

Nov 10, 2010 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

What is the code p3 at Mr Slim thermostat


Signal transmission error (Remote control does not respond to indoor unit)

Causes:
Bad contact of transmission wire
Signal transmitting/receiving circuit is abnormal
Wrong operation due to noise interference by another appliance

Mitsubishi recommend replacing the transmission cables, the controller or the indoor board. Had the same problem myself one, I ran new temporary transmission cables. The unit ran no bother. Swapped the transmission cables for the original and the fault disappeared.

Jun 10, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Mr.slim thermostat flashin and display p3


Signal transmission error (Remote control does not respond to indoor unit)

Causes:
Bad contact of transmission wire
Signal transmitting/receiving circuit is abnormal
Wrong operation due to noise interference by another appliance

Mitsubishi recommend replacing the transmission cables, the controller or the indoor board. Had the same problem myself one, I ran new temporary transmission cables. The unit ran no bother. Swapped the transmission cables for the original and the fault disappeared.

Jun 10, 2009 | Heating & Cooling

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