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Lost communication with outdoor panel

The LED display still appears on the indoor panel but all the automatic functions of the system and the ability to control the system from the indoor panel has stopped working.

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Posted on Jan 02, 2017

  • 5370 Answers

SOURCE: I have an Intellitouch I+7

Bad wiring run from Outdoor Control Panel/Personality board in the Load Center or Power Center. ------- Verify cable and insure no connections are broken.In some cases a wire is broken under the insulation. The two center wires of the four conductor cable are suspect (Green and Yellow). ------------ Incorrect address.:----------Indoor control Panel has a different address than the Outdoor control Panel. Press RESET then AUX 1 button. Go to the Indoor Control Panel and lock on ADDRESS. ---------- But if all this possibilities are checked ok and all wiring connections are firm and wires are not loose/ cracked then its motherboard related issue.------ ---------- This should help.Thanks.Helpmech.

Posted on May 16, 2011

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1 Answer

When we put on the air conditioner it shows F1 or ERROR on the window. What is the problem?


Hi Charity, F1 is a communication fault, I hope this helps......... CHEERS..
1?Check whether the connection of the outdoor unit and indoor unit is one to one, otherwise connect the L, N and communication line of the indoor unit and outdoor unit one to one.
2?Measure whether the voltage between the zero line and the communication line is 18V-30AC half-wave signal, check whether the communication circuit on the indoor and outdoor electric control board has been damaged, otherwise replace it.
3?Check whether the LED on the outdoor power board has been on, otherwise replace the electric control board.
4?Check whether the unit is abnormal caused by the external interference, if it is, then find the interfering source, and removes it.
http://www.chigo.bg/resources/pdf/Failure-code-manual.pdf

May 10, 2016 | grunaire GSI241HXB / GSU241HXB 24,000 BTU...

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

Error Code E7?


Feature : E7 Error code on indoor unit display panel
  • Answer :Reason:
    Communication fault between indoor and outdoor unit
    Solution:
    This may be caused by:
    1.wrong connection of cable,
    2.indoor PCB, outdoor PCB fault, or power module fault
    3.cable connection loose

Mar 29, 2015 | Refrigerators

1 Answer

Error message U4


Signal transmission error. Indoor and outdoor PCB's cannot communicate. Usually a faulty controller board in the outdoor unit. If the indoor unit otherwise functions normally (can control fan speed, louvres, beeps in replay to all remote buttons) then it is probably OK so check outdoor controller PCB.

Jul 21, 2014 | Daikin Mini Split Concealed Duct Units

1 Answer

I have an LG split system air conditioner model number LSZ244VN-4 it is coming up with a fault code of CS after it has been running for approx 5 minutes


There is no CS code. Please read as C5.
Fault Code 05 and 53 (CH05 is displayed at indoor unit, 53 is displayed at outdoor unit)
This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
signal will only be present for the first 3 mins of operation.
Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
unit, you should see a fluctuating 0-72 Vdc.
If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
and 2 or Earth (Black probe), you should see a steady voltage in the range of -0.1 to -10.0 Vdc. If No Voltage
is present either the cable or Indoor PCB must be faulty. This can be determined by checking the voltage
output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault.

Jan 19, 2011 | Heating & Cooling

1 Answer

I have a LG Inverter Art cool and after about 5 minutes it stops and C5 shows on the panel Kerrie


Fault Code 05.
This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
signal will only be present for the first 3 mins of operation.
Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
unit, you should see a fluctuating 0-72 Vdc.
If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
and 2 or Earth (Black probe), you should see a steady voltage in the range of -0.1 to -10.0 Vdc. If No Voltage
is present either the cable or Indoor PCB must be faulty. This can be determined by checking the voltage
output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault. Helpful?

Jan 19, 2011 | LG Art Cool LA121CNP wall/window Air...

1 Answer

Air conditioner shuts off


C5
Communication Error

• Wrong or missing wiring between indoor and outdoor unit cable

• Defect of communication components in indoor pcb assembly

• Defect of communication components in outdoor pcb assembly

• Defect of power supply components in outdoor pcb assembly

• No ground connection in air conditioner unit

(affected by noise in power source)

Jun 30, 2009 | LG Heating & Cooling

1 Answer

Displaying "Co" code, and running when turned off with the remote


It sounds like you have lost communication between the indoor and outdoor units. This can be one of two things. Either the connection indoor or outdoor is loose or bad, or a rat may have eaten the cable in cieling.

Feb 28, 2009 | LG Art Cool LA121HNP Split System Air...

3 Answers

Ch 5 error code


ch5 error code, means that there is a
communication error (serial comunication) between the outdoor and the indoor unit.
Only for LG-airconditioners.

Jan 02, 2009 | LG Art Cool LA121HNP Split System Air...

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