TCL INVERTER AIR-CONDITIONER
ERROR CODES CAUSES AND SOLUTION
Troubleshooting
(1) Display E1 or E2:
(1) Display E1 or E2:
1. Contact between indoor temperature sensor CN6
(RT, IPT) and slot
2. Measure the resistance on the two ends of indoor temperature sensor: (25 / 5K ℃ Ω).
2. Measure the resistance on the two ends of indoor temperature sensor: (25 / 5K ℃ Ω).
Replace the temperature sensor if the resistance
is incurred to drift, open or short circuiting.
(2) Display E6
1. Check the indoor cross-flow fan blade
If the fan does not run, readjust the fan
position until it can run smoothly.
2.If the motor insert (CN3, CN4) on indoor main PCB is in good contact with the slot
2.If the motor insert (CN3, CN4) on indoor main PCB is in good contact with the slot
Insert again if loose
3. Startup capacitance value
3. Startup capacitance value
Capacitance incorrect. Replace with a new
capacitor.
(3) Display E3, E7, E8
1.If the temperature sensor on outdoor power
source board is in good contact with the slot (CN1, CN2)
Insert again if loose.
2. Measure the resistance on the two ends of outdoor temperature sensor: Resistance of CN1 terminal sensor – (25 / 5K ℃ Ω).
2. Measure the resistance on the two ends of outdoor temperature sensor: Resistance of CN1 terminal sensor – (25 / 5K ℃ Ω).
Replace the temperature sensor if the resistance
is incurred to drift, open or short circuiting
(4) Display E4
1 Check the high-pressure and low-pressure
valves.
If not open, open again to ensure the system
circulation is smooth.
2 Check the system refrigerant (Start and run under cooling mode. When the compressor
is started, check the outlet temperature for its change. If the change is not
obvious after 5 minutes)
The system is in shortage of refrigerant. Test
with pressure gauge, check the leakage point and recharge the refrigerant.
3.Check the evaporator coil temperature sensor
(25 /5K ℃ Ω).
Replace the temperature sensor if the resistance
is incurred to drift, open or short circuiting.
4. The above inspections are normal
1. The flow might be uneven for indoor system.
Short circuit JP4 jumper of the indoor control board to shield this protection
function (V1 – Indoor Main PCB).
2. The flow might be uneven for indoor system. Dial the JP4 switch of the outdoor power source board to position “1” to shield this protection function (V4 – Power Source Board).
Replace the indoor main PCB if the problem cannot be solved by using the above methods.
2. The flow might be uneven for indoor system. Dial the JP4 switch of the outdoor power source board to position “1” to shield this protection function (V4 – Power Source Board).
Replace the indoor main PCB if the problem cannot be solved by using the above methods.
(5) Display EC
1. Check the contact of communication wire (CN5)
between power source board and intelligent power module
Insert again if loose.
2. After the complete unit is energized, check
the indicators on outdoor power source board and intelligent power module
The indicator on power source board blinks
normal (bright for 1 second and dark for 1 second), but the indicator on
intelligent power module does not work normally.
Replace the intelligent power module
If the fault remains unsolved, replace the power
source board again
The indicator on intelligent power module blinks
normal (bright for 1 second and dark for 1 second), but the indicator on power
source board does not work normally
Replace the power source board
If the fault remains unsolved, replace the
intelligent power module again.
(6) Display EP
1. Check the insert position CN3 of the compressor
top temperature switch wires on outdoor power source board.
Insert again if loose.
No switch on compressor top
No switch on compressor top
Jumper short-circuiting (This function not
provided for 1 – 1.5P unit)
2. Compressor temperature. The temperature is
very high, accompanied with bad smell.
Check the U, V and W wires of the compressor.
The correct sequence of U. V and W wiring shall
be “red, white and blue”. Connect again if incorrect.
Check the system pressure.
The pressure is low. Add refrigerant to ensure
the system pressure is normal
Check the outdoor ventilation and if there is
any obstruction that affects the normal radiating of the air conditione
Install to the position as required in the
Instruction Manual and ensure the air inlet and outlet of the outdoor unit is
smooth.
3.Compressor temperature: The temperature is not
high. Short circuit CN3.
If the fault is solved after short circuiting,
replace the shell temperature switch.
If the fault remains unsolved after replacing the
shell temperature switch, please replace the outdoor power source board.
(7) Display EA
1 Check for refrigerant leakage
Find the leakage point and recharge the refrigerant
Find the leakage point and recharge the refrigerant
2 V1 inverter unit : Test the voltage of 5# pin
to 2# pin on power factor correction
If not
higher than 0.4V, replace power factor correction
If higher than 0.4V, replace the intelligent
power module
3. V2、V3、V4、V5、VP1、VP2 inverter unit
Replace the outdoor power source board
(8) Display EU
Replace the outdoor power source board
(8) Display EU
1.V1 inverter unit: Communication wires between
outdoor power source board and intelligent power module (CN5)
Insert again if loose.
If the fault remains unsolved after connection again, please replace the outdoor power source board.
If the fault remains unsolved after connection again, please replace the outdoor power source board.
If the fault remains unsolved after replacement
of outdoor power source board, please replace the intelligent power module.
2.V2、V3、V4、V5、VP1、VP2 Inverter Unit
Replace the outdoor power source board
(9) Display EE
1.Shut down the power supply and re-energize. If
the fault remains, it is needed to check if the indoor EEPROM installation is
loose or improper.
Fix again2. If the installation is good:
Replace the indoor main PCB firstly
3. If the fault remains unsolved after replacement
of the indoor control board:
Outdoor power source board
Outdoor power source board
(10) Display P1
1.Test the supply voltage if it is between 160V ～260V（ AC） .
It is normal protection if exceeding this range.
It is normal protection if exceeding this range.
2.Test if the voltage between L and N terminal
of outdoor unit is within 160V～260V（ AC） It is normal protection if exceeding this range.
3. If the voltage is normal: Replace the outdoor
power source board
(11) Display P2
1.Check if the outdoor fan motor is stopped due
to overheat protection, or damaged, and if the fan capacitor
Replace the damaged capacitor and the damaged outdoor fan motor.
Replace the damaged capacitor and the damaged outdoor fan motor.
2. power source board or intelligent power
module damaged
VP1-- Replace the power source board
V1-- Replace the intelligent power module.
V4 and VP2-- Replace the intelligent power module.
VP1-- Replace the power source board
V1-- Replace the intelligent power module.
V4 and VP2-- Replace the intelligent power module.
(12) Display P4
1.Check if the air inlet and outlet of outdoor
unit is blocked by any obstructions.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
2. Check the system for shortage of refrigerant.
Add refrigerant
3.Check if the exhaust temperature sensor is
drifted, short circuited or open circuited. (25 /20K ℃ Ω).
Replace the
exhaust temperature sensor
4.Control board damaged
Replace the outdoor power source board.
(13) Display P5
1.Check if the air inlet and outlet of indoor
unit is blocked by any obstructions.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
2, Check the system for shortage of refrigerant.
Add refrigerant
3.Check if the exhaust temperature sensor is drifted,
short circuited or open circuited. (Measure the resistance of the resistors on
two ends of indoor temperature sensor: (25 / 5K ℃ Ω).
Replace room
temperature sensor (IRT) and Indoor pipe (coil) temperature sensor (IPT)
4. Control board damaged
Replace the indoor control board
(14) Display P6
1. Check if the air inlet and outlet of outdoor unit is blocked by any obstructions.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
2. Check the system for shortage of refrigerant.
Add refrigerant
Add refrigerant
3. Check if the outdoor evaporator coil temperature
sensor is drifted, short circuited or open circuited (25 /5K ℃ Ω).
Replace the outdoor coil temperature sensor.
Replace the outdoor coil temperature sensor.
4. Control board damaged
Replace the outdoor power source board.
(15) Display P7
1.Check if the air inlet and outlet of outdoor
unit is blocked by any obstructions.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
Install to the position as required in the Instruction Manual and ensure the air inlet and outlet of the outdoor unit is smooth.
2. Check the system for shortage of refrigerant.
Add refrigerant
3.Check if the exhaust temperature sensor is drifted,
short circuited or open circuited. (Measure the resistance of the resistors on
two ends of indoor temperature sensor: (25 / 5K ℃ Ω).
Replace the Room
temperature sensor(IRT) and Indoor pipe(coil) temperature sensor(IPT)
(16) Display P8
1.The compressor cannot run under cooling mode
when the outdoor temperature is lower than -1 , or run ℃ under
heating mode when the outdoor temperature is higher than 33 , whilst ℃ the
compressor alarms P8 protection.
Normal
protection function
2.If the temperature is not within the protective
range above,. Use the multimeter to measure the resistors on the two ends of outdoor
intake temperature sensor (CN1) (25 /5K ℃ Ω).
Replace the
sensor if it is incurred to drift, open circuiting or short circuiting.
Other faults
1) The indoor unit works normally but the outdoor unit does not work. Cause Analysis:
a) If fault code is displayed: If yes, treat according to fault code. If no, check according to the following steps.
b) If the outdoor fan runs normally (The outdoor fan is started 5 seconds before the compressor is started, and it is stopped 15 seconds after the compressor is stopped), the client might make wrong judgment on that the outdoor unit does not work because the compressor working frequency is low or the system is in shortage of refrigerant. Check the system cooling / heating effect and confirm if the system is in shortage of refrigerant.
c) Check if the resistance of each temperature sensor is drifted (See appendix for the temperature sensor parameters): If yes, replace the temperature sensor.
d) Check if the JP3 jumper of indoor control board is soldered. If not, solder the jumper. Then restart the unit and check what protection code will be displayed. Treat according to the fault code.
e) Check if the indoor / outdoor and circuit board wiring. Check if the connection is secure. Please tighten the wires.
2) The outdoor unit is stopped when the air conditioner has run for a period of time Cause Analysis:
a) If any fault is displayed after stop: If yes, treat according to fault code. If not, check according to Step (b).
b) Check if the supply voltage is normal, including the voltage change when the air condition is started. If the voltage is unstable or changes too heavily, please check the power source. If no problem, check according to Step (c).
c) Check if the temperature sensors are normal (See appendix for the temperature sensor parameters). Check if the resistance is drifted, open circuited or short circuited. If yes, replace the sensor. If normal, check according to Step (d).
d) Check if the indoor / outdoor circuit connection and power connection are in good contact. If no, tighten the connection wires. If yes, check according to Step (e).
e) Check if the JP3 jumper of indoor control board is soldered. If not, solder the jumper. Then restart the unit and check what protection code will be displayed. Treat according to the fault code.
f) Check if the refrigerant is too much or too less. If yes, add refrigerant.
3) The air conditioner is tripped when it is started.
Cause Analysis:
a) Check if the user's power source plug is correctly connected (for example, the ground wire might be wrongly connected as the neutral wire)
b) Check if the indoor / outdoor circuit and the wiring terminal are correctly connected, and if there is short circuiting.
c) Check if the outdoor circuit board, wiring terminal and power connection wires are damaged, and if there is short circuiting to the metal parts.
d) Check if the rectifier bridge of outdoor controller (See appendix for its bridge) is short circuited (The short circuiting of rectifier bridge will probably cause tripping error).
4) The complete unit does not work Cause Analysis:
a) If fault code is displayed: If yes, treat according to fault code. If no, check according to Step (2).
b) Check if the power plug is electrified. If no, check the power source. If yes, check if the
controller fuse is good.. If no, replace the fuse. If yes, check according to Step (3).
c) Check if the resistance of the sensors on indoor and outdoor units is drifted. If yes, replace the sensor. If no, check according to Step (4).
d) Check if the indoor and outdoor communication is failed. The step is same as that for check
when the indoor unit works normally but the outdoor unit does not work.
1) The indoor unit works normally but the outdoor unit does not work. Cause Analysis:
a) If fault code is displayed: If yes, treat according to fault code. If no, check according to the following steps.
b) If the outdoor fan runs normally (The outdoor fan is started 5 seconds before the compressor is started, and it is stopped 15 seconds after the compressor is stopped), the client might make wrong judgment on that the outdoor unit does not work because the compressor working frequency is low or the system is in shortage of refrigerant. Check the system cooling / heating effect and confirm if the system is in shortage of refrigerant.
c) Check if the resistance of each temperature sensor is drifted (See appendix for the temperature sensor parameters): If yes, replace the temperature sensor.
d) Check if the JP3 jumper of indoor control board is soldered. If not, solder the jumper. Then restart the unit and check what protection code will be displayed. Treat according to the fault code.
e) Check if the indoor / outdoor and circuit board wiring. Check if the connection is secure. Please tighten the wires.
2) The outdoor unit is stopped when the air conditioner has run for a period of time Cause Analysis:
a) If any fault is displayed after stop: If yes, treat according to fault code. If not, check according to Step (b).
b) Check if the supply voltage is normal, including the voltage change when the air condition is started. If the voltage is unstable or changes too heavily, please check the power source. If no problem, check according to Step (c).
c) Check if the temperature sensors are normal (See appendix for the temperature sensor parameters). Check if the resistance is drifted, open circuited or short circuited. If yes, replace the sensor. If normal, check according to Step (d).
d) Check if the indoor / outdoor circuit connection and power connection are in good contact. If no, tighten the connection wires. If yes, check according to Step (e).
e) Check if the JP3 jumper of indoor control board is soldered. If not, solder the jumper. Then restart the unit and check what protection code will be displayed. Treat according to the fault code.
f) Check if the refrigerant is too much or too less. If yes, add refrigerant.
3) The air conditioner is tripped when it is started.
Cause Analysis:
a) Check if the user's power source plug is correctly connected (for example, the ground wire might be wrongly connected as the neutral wire)
b) Check if the indoor / outdoor circuit and the wiring terminal are correctly connected, and if there is short circuiting.
c) Check if the outdoor circuit board, wiring terminal and power connection wires are damaged, and if there is short circuiting to the metal parts.
d) Check if the rectifier bridge of outdoor controller (See appendix for its bridge) is short circuited (The short circuiting of rectifier bridge will probably cause tripping error).
4) The complete unit does not work Cause Analysis:
a) If fault code is displayed: If yes, treat according to fault code. If no, check according to Step (2).
b) Check if the power plug is electrified. If no, check the power source. If yes, check if the
controller fuse is good.. If no, replace the fuse. If yes, check according to Step (3).
c) Check if the resistance of the sensors on indoor and outdoor units is drifted. If yes, replace the sensor. If no, check according to Step (4).
d) Check if the indoor and outdoor communication is failed. The step is same as that for check
when the indoor unit works normally but the outdoor unit does not work.
