Errors of Lessar air conditioners: identification of breakdowns by code and instruction on troubleshooting

Lessar air conditioning systems are practical and safe equipment to use. It is equipped with high-quality protection against voltage drops, temperature increase / decrease, self-diagnosis system. In order for the owner to be able to determine the malfunction himself, the errors of the Lessar air conditioners are displayed on the display of the device.

We will tell you how breakdowns of the climate unit are identified by special codes and indicators. Let us show you how you can independently determine the violation of the software, sensors, other parts and mechanisms. Agree, it is important to identify a problem in the system in a timely manner so that you do not have to buy new equipment.

The article examines the common types of errors in various models of split-systems of this brand, as well as ways to identify malfunctions and ways to eliminate them. The presented instructions for eliminating breakdowns and malfunctions in the system will help to assess the complexity of the work and make a decision - to correct errors independently or contact the workshop.

Features of the self-diagnosis

If a breakdown, a malfunction in the electronics is detected, the Lessar climate system diagnostic system issues an error code on the front of the indoor unit panel or control panel. The fault code is a letter on the screen and a combination of LEDs that flash in a certain order.

The error indication and alphanumeric code are displayed until the incorrect operation of the system is completely eliminated.

All models of Lessar equipment are subject to some damage in cases of improper installation and operation. To do this, each air conditioner model is equipped with an automatic error search function for subsequent troubleshooting

If the split system does not function correctly, you must pay attention to the display. There the error of the device is displayed. Thanks to their presence, the user will be able to independently identify the cause of the malfunction and, if possible, eliminate it.In the event of a complex violation, you will need to contact the service center for help.

For self-troubleshooting, it is necessary to understand in more detail the design features of the climate equipment.

Household (wall mounted, multisplitsystems) and semi-industrial (cassette, floor-ceiling, duct, column type) systems consist of two parts, which are interconnected by a freon path - the internal and external compressor-condenser unit.

The air conditioner main connects the blocks and consists of a signal and connecting power cable, copper pipes for passing freon and a drain pipe for draining the liquid from the room. To protect against the effects of environmental factors, the track is placed in a durable vinyl tube

The design of the internal evaporative block consists of a network cable, a front panel, filter elements, shutters, an evaporator, a fan, a tray for accumulated condensate, and a control board.

The components of the external unit of the split system are: compressor, 4-way valve, condenser temperature sensor, capillary tube, filter, control board, fan. More powerful air conditioners - 36-60 thousand BTU - are additionally equipped with high and low pressure switches, a silencer, various filters, a battery, an air temperature sensor.

After familiarizing with the scheme of the air conditioning system, the user will be able to identify a breakdown, change and even repair a part or mechanism that has failed.

Error codes in household units

Before self-diagnosis of errors in Lessar units, the parameters of the input voltage should be checked, the values ​​of which should be within the normal range +/- 10%. You should also make sure that the connection of external, internal blocks is correct. If the split system is not connected correctly, the diagnostic measures performed will not give the correct result.

In domestic climate equipment, malfunctions can occur both in the internal part and in the outdoor unit.

#1. Troubleshooting indoor unit

Consider the common mistakes that occur when operating units at home, and how to fix them.

In the event of a malfunction of a node in the technique, an alphanumeric value appears on the display, based on which the user can understand the cause of the violation and correct existing errors in the system

It is not recommended to independently solve problems with the air conditioning system when there is a burning smell. Do not try to repair it yourself with frequent tripping of the internal circuit breaker, heating the cable or outlet to which the unit is connected, the occurrence of uncharacteristic noises and creaks, water entering the room.

In all these cases, immediately disconnect the device from the power supply and contact a service center for help.

Internal Volatile Memory Error (EEPROM Software) - E0, the indicator lights up 1 time.

The microcircuit works only in the "read" mode, which can be reprogrammed by applying a pulse current.

The reasons for the breakdown:

• violation of equipment installation technology;
• board malfunctions.

Ways of elimination:

• disconnect the unit from the power system;
• start the device in 2-3 minutes;
• make sure the air conditioner is working properly;
• if the code reappears, replace the control board.

Incorrect communication between blocks - E1flashes 2 times. Such an error occurs when there is no response from the indoor unit more than three times in a row for about two minutes.

Causes:

• insufficiently good quality power cord;
• incorrectly connected wires;
• board failed.

Ways of elimination:

• turn off for 2 minutes, then turn the device back on;
• when the code reappears, check for voltage between the red and black terminals on the outdoor unit;
• in the absence of voltage, diagnose the connection of wires to the inside of the split system;
• check throttles and replace if necessary.

In case of a repeated error, it is necessary to completely replace the outdoor unit board.

If the E1 code appears on the screen again, you will need to replace the board in the indoor unit. Thanks to this action, the connection between the system designs will be completely restored

Carrier Error - E2, the indicator lights up 3 times.

Causes:

• poorly executed device installation;
• broken board.

Ways of elimination:

• restart the system after a few minutes;
• if the problem persists, you will need to replace the boards in two blocks.

No fan speed control - E3, 4 times the display lights up. The problem manifests itself in the case when its speed gradually decreases and is less than 300 revolutions per minute.

Causes:

• wire connections are broken;
• the motor is broken or the fan wheel is jammed;
• the control system does not work.

Ways of elimination:

• carry out diagnostic reconnection of the unit to the network;
• disconnect the device and check the correct movement of the impeller;
• make sure the wires are connected correctly between the fan and the board;
• check for voltage at the terminals of the part;
• if not, replace the board.

If current flows, then the fan is out of order: it will need to be replaced with a new one.

To check the operation of the fan, it is necessary to turn on the climatic equipment and select the maximum speed of the diagnosed part. After starting it, the voltage indicators at terminals 1 and 2 should be measured within 12-15 seconds. If less than 100 V, the problem is the breakdown of the board, which should be changed

Sensor failure t ° air flow - E4, 5 times the signal. Open circuit or short circuit of the heat exchanger sensor t ° - E5, 6 times. Errors E4 and E5 are issued in case of power surges above or below the standard values ​​- 0.06-4.94 V.

Causes:

• mechanism breakdown;
• incorrectly connected part.

Ways of elimination:

• check the correct connection of the sensor with a voltmeter;
• compare the received resistance data with the tabular ones;
• if the indicators do not match, replace the spare part;
• otherwise, change the fee.

Communication problem between display boards and indoor unit - E7, Flickers 9 times.

Causes:

• breakage of wire connections in the electronic system;
• wrong connection;
• circuit board failure.

Ways of elimination:

• check the integrity of the wires and the correctness of their connection to the boards;
• check the operation of the multimeter control boards one at a time;
• replace them if necessary.

The coolant leak is detected - EC, the light signal is carried out 7 times.

The leakage problem is fixed when the system trips three times if the user-specified temperature is not maintained for four seconds

Causes:

• freon leaked;
• the temperature sensor is not functioning properly;
• board malfunction;
• lack of sufficient air exchange in the outer part of the structure;
• pollution of the heat exchanger of the outdoor unit;
• track hall.

Ways of elimination:

• restarting the system after a while;
• in cooling mode, the actual t ° of the air masses entering the room should be checked;
• when warm air arrives, it is necessary to check the presence of a working fluid in the system and the pressure level;
• inspect the outer part of the split system for contamination, eliminate them if necessary;
• in the event of cool air leaving the device, it will also be necessary to diagnose the temperature sensor according to the scheme, as with code E4;
• if the part is serviceable, the control board must be replaced.

Current overload error - F0, signals 1 time.

The microprocessor receives a signal about the excess of electricity consumption by the compressor and after 2-3 seconds the protection is activated and an error occurs. This allows you to prevent the ignition of the device, contact fusion, compressor failure

Causes:

• short circuit between turns;
• short circuit;
• making mistakes when filling with refrigerant, especially in winter;
• jamming of the compressor.

Ways of elimination:

• release access to the compressor;
• if the unit does not start when the equipment is turned on in cooling mode, it is necessary to ring it and check the connection circuits;
• repair a short in the wires;
• if a short circuit is detected, it will be necessary to change the compressor;
• if there is no short circuit, check the serviceability of the sensor, power module and completely replace the board;
• if high pressure in the system persists, the heat exchangers must be cleaned of dust and dirt.

After these steps, it is necessary to turn on the air conditioner again and check whether the error code appears again. The second problem is the detection of strong vibration, high pressure on the lines indicate that the compressor block is jammed. If it is not possible to restore it, a replacement should be made.

If the pressure remains as high, the air conditioner will need to be refilled.

# 2 Registration of damage to the external unit

The problem with the t ° air sensor is F1, the indicator blinks 2 times, the timer is constantly on.

Heat exchanger sensor t ° error - F2, lights up 3 times, the timer is constantly on.

Short circuit / open circuit of the compressor discharge sensor t ° - F3, Flashes 4 times, the timer is highlighted.

Diagnosis of problems F1, F2, F3 is carried out in the same way as in the case of errors with sensors t ° of the indoor unit.

Verification of the values ​​should be carried out in accordance with the table of dependencies of the resistance of the temperature sensors. It presents a range of t ° from -20 to +42 ° C and standard values ​​of resistance in kOhm

EEPROM Error - F4, 5 times the display lights up, while the timer does not turn off. In this case, the main processor does not receive a signal from the memory chip. Damage is eliminated, as in the internal part of the split system, by replacing the board.

Fan speed control violation - F5, the indicator lights up 6 times, the timer is on. It works when the number of revolutions is reduced to less than 300 per minute.

Causes:

• error connecting wired connections;
• the motor does not work, the fan impeller;
• Replacing a broken board is required.

Ways of elimination:

1. Fan repair with integrated microcircuit. When the climate equipment is in standby mode and connected to the mains, measure the voltage between pins 1 and 3, 4 and 3 of the mechanism. If the received value does not fall in the range indicated in the table, the board will need to be replaced.
2. Diagnostics of the fan models WZDK36-38G-W, WZDK40-38G-W-1 with a control chip on the board. To check the health of the node, you must connect it to the network. If the mechanism works, a replacement board will be required. If the fan does not turn on, you need to check the resistance of the windings on each pair of pins.

The considered methods will completely eliminate the error and restore the correct operation of the device.

Power module error and inverter module protection - P0, 1 time failure indicator and timer light up. The code appears when the voltage exceeds or decreases, which the power module sends to the compressor.

To take measurements, you must use a digital tester. In the case of obtaining different values ​​from different pairs, the fan has failed, which will need to be replaced. If the values ​​are the same, install a new board.

Causes:

• wrong connection;
• fan breakdown in the external device of the split system;
• failure compressor;
• malfunction of the main board;
• power module failure.

Ways of elimination:

• pre-check the correct connection of the compressor with the board;
• inspect the power module, measure the resistance between P and the terminals U, V, W, N, as well as N and U, V, W (should be equal to MΩ - infinity), replace it if necessary;
• a similar action must be carried out with the control board of the outdoor unit;
• check if the fan is broken and replace it in case of failure;
• measure the compressor winding resistance and compare with the table.

System surge protection - P1The error indicator and timer blink 2 times. It works at critically low and high values.

Causes:

• Electricity problems;
• interference in the air exchange system;
• freon leakage;
• board operation error.

Ways of elimination:

• check for power in the system;
• if the parameters do not match, turn off the device;
• check the integrity of the wires and the correctness of their connection;
• measure the voltage between the terminals P and N on the power module and, if the standard values ​​are not in compliance, replace it.

You will also need to additionally inspect the chokes and replace them in the event of a breakdown.

If after the measures taken, the error on the P0 code could not be eliminated, it will be necessary to replace the main board of the external design of the split system

Compressor overheating protection - P2The error indicator and timer flicker 3 times.

Causes:

• Electricity problems;
• air exchange lock;
• coolant leak;
• board error.

Ways of elimination:

• diagnose the air exchange of the indoor and outdoor units, clean the heat exchangers if there is dust on them;
• disconnect the device from the power supply;
• after 10-15 minutes measure the compressor t °;
• check the correctness of its connection, as well as overload protection;
• inspect the hydraulic circuit;
• check the resistance at the terminals of the protection unit, which should normally tend to 0;
• when receiving large readings, it will be necessary to replace it;
• if the compressor is in good condition, the reason for the Lessar air conditioner error code P2 is the failure of the board, which will need to be replaced in the outdoor unit.

The problem with starting the compressor is P4, 5 times the indicator and timer light up. The error is determined by checking the communication signals, voltage, number of revolutions of the compressor shaft.

Causes:

• incorrect connection of the node;
• power module failure;
• compressor breakdown;
• The main control board is out of order.

Ways of elimination:

• check the correctness and quality of the connection of wires between the board and the compressor;
• inspect the IPM power module, and in case of failure, replace it;
• if, after checking the compressor winding resistance, the indicators are not normal, replace the unit.

In case of repeated display of the error, the replacement of the control board will be required.

After the actions taken, the compressor is installed in the space provided for it, the complete assembly of the external unit is carried out, after which the system is launched and its diagnostics are carried out

If error codes E, F are displayed, you must immediately disconnect the device from the power supply and eliminate the cause of the malfunction yourself or contact a service center. In the event of a P code malfunction, the unit will start immediately after restoring the parameters. If the air conditioner does not restart, you will need to check for errors and eliminate them.

Faults in commercial air conditioners

In addition to errors in household appliances, in semi-industrial cassette systems, most errors are identical, but other types of malfunctions are encountered.

For example, in the LS-HE12BCOA2 / LU-HE12UOA2, LS-HE18BCOA2 / LU-HE18UOA2 models, the following additional codes are provided:

• condensate tank overflow - Ee;
• communication failure between the main and additional blocks of the system - E8;
• other errors (for several blocks) - E9;
• protection operation in case of low pressure - P6;
• power module error - P7;
• evaporator protection at high t ° - J0;
• high t ° capacitor protection - J1;
• PFC module protection - J3;
• communication failure between compressor and control chips - J4;
• high pressure protection - J5;
• low pressure protection - J6;
• AC input voltage protection - J8.

When using the unit at low temperatures, the letter LC may appear on the screen periodically.

Also, in the outdoor units of these split systems, there may be errors that are displayed by highlighting the indicators. The table shows typical faults for the model of the external unit LU-HE12UOA2

In the models of the Business LS / LU-H18 / 24BEA2, LS / LU-H36 / 41/48 / 60BEA4 series, the following errors of the internal system design are encountered:

Error codes of the external unit are displayed by LED1, LED2 and LED3.

Each type of malfunction is determined by visual inspection: indicators can flash several times or light up continuously

The elimination of problems in the operation of commercial air conditioners should be performed according to similar algorithms discussed in the section on resolving errors in household units.

Conclusions and useful video on the topic

An example of the correct operation of the Lessar device:

The location of the main components and parts of the air conditioner for debugging in case of errors, considered on the example of the Rational model range:

To eliminate any malfunction in the Lessar domestic, semi-industrial air conditioner, it is necessary to study in detail the design features of the system units. The hydraulic and electrical circuits specified in the technical instructions will allow for self-diagnostics of the device, as well as self-repair of failed parts and microcircuits.

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