When a Daikin VRV central air conditioning system displays error code E3-13, E3-14 or E3-15, one of the items to check is the liquid line stop valve. However, this error code does not necessarily mean that the valve is closed or faulty. Technicians need to identify the correct equipment model, refer to the technical documentation and check related components to determine the cause. HRT shares important information about this group of error codes and points to note when diagnosing the system.
What Are VRV Error Codes E3-13, E3-14, E3-15?
On Daikin VRV IV+ Heat Pump systems, E3-13, E3-14 and E3-15 belong to the Liquid stop valve check error group, meaning an error in checking the liquid line stop valve.
In the configuration covered by the VRV IV+ Heat Pump technical documentation, the three error codes are distinguished by outdoor unit position. E3-13 corresponds to the main outdoor unit (Main), E3-14 corresponds to auxiliary outdoor unit 1 (Sub 1) and E3-15 corresponds to auxiliary outdoor unit 2 (Sub 2).
This distinction must be applied within the scope of the relevant documentation. It should not be assumed that all VRV generations support or display these three error codes in the same way. When diagnosing the system, technicians need to identify the outdoor unit model and use the corresponding Service Manual.
What does a liquid line stop valve check error mean?
The liquid line stop valve is a component of the refrigerant circuit that opens or closes the refrigerant flow path according to the system design. The valve's status affects the operation and checking of the VRV system.
When a liquid line stop valve check error occurs, the valve's status must be verified, followed by checks of the items specified in the technical documentation. The error code alone cannot establish that the valve is stuck, is not fully open or that a specific component has failed.
Read More VRV Error Codes E3-2, E3-4, E3-6: Causes and Solutions
Possible Causes of Errors E3-13, E3-14, E3-15
Liquid line stop valve not opened to the correct position
The stop valve's status is the first item to check in the diagnostic procedure described in the relevant technical documentation. If the valve is not in the required operating position, refrigerant circulation may be affected.
Technicians need to check the valve according to the manufacturer's instructions and confirm its actual status before reaching a conclusion. The valve should not be opened or closed arbitrarily before technical and safety requirements have been met.
High-pressure sensor abnormality
The high-pressure sensor provides information for system monitoring and control. If the sensor signal is inconsistent with operating conditions, the diagnostic process may require further checks of the sensor, electrical connections and measurement signal.
However, E3-13, E3-14 or E3-15 is not sufficient to establish that the high-pressure sensor has failed. The assessment must be based on actual inspection results and the guidance for the correct equipment model.
Incorrect refrigerant charge
A refrigerant charge that does not meet requirements can affect the operating conditions of the refrigeration circuit. Therefore, the technical documentation includes checking the refrigerant charge among the items to consider when diagnosing the error.
It should not be concluded that the system is overcharged with refrigerant based solely on the error code. Technicians need to review installation data, refrigerant charging history and the manufacturer's inspection procedure before deciding to adjust the charge.
Non-condensable gases or moisture in the refrigeration circuit
Non-condensable gases and moisture are factors to consider when assessing the condition of the refrigerant circuit. If their presence is suspected, an appropriate inspection procedure must be carried out according to the technical documentation, rather than adding refrigerant based on guesswork.
Blockage in the refrigerant circuit
A blockage in the refrigeration circuit can affect refrigerant circulation. This is also one of the items to check when the initial diagnostic steps have not identified the cause.
The inspection must be based on the actual system configuration and the corresponding technical guidance. Components should not be replaced without evidence that they are causing the fault.
Problem with the condenser-side expansion valve or main circuit board
If the previous checks have not identified the cause, technicians need to further examine the condenser-side expansion valve and main circuit board in the sequence specified in the Service Manual.
These items need to be verified using appropriate inspection methods. Replacing the expansion valve or circuit board based solely on the error code may result in unnecessary repairs.
Read More Error Code E1-1: Outdoor Unit Circuit Board Fault and Solutions
Procedure for Checking and Resolving VRV Errors E3-13, E3-14, E3-15
Identify the model and the conditions under which the error occurs
First, identify the outdoor unit model, VRV generation and main or auxiliary outdoor unit configuration. Technicians need to record the displayed error code, when it occurred and the system's operating condition.
This information helps select the correct Service Manual and avoid incorrectly applying an error code table or inspection procedure intended for another equipment range.
Check the liquid line stop valve
Next, check the status of the liquid line stop valve and related valves according to the manufacturer's instructions. Confirm that the valves are in positions appropriate for the equipment's operating requirements.
Valve operation must be performed by qualified personnel in accordance with safety procedures and the system's technical requirements. Valves should not be opened or closed without authorization when the equipment is in a condition that does not permit such operation.
Check the high-pressure sensor
If the valve status is correct but the fault persists, continue checking the high-pressure sensor in accordance with the technical documentation. Checks may include the connection condition and sensor signal, using the method specified by the manufacturer.
Do not replace the sensor before an abnormality has been verified.
Assess the refrigerant charge and refrigerant circuit condition
The technician needs to assess the refrigerant charge, the possible presence of non-condensable gases or moisture, and circulation within the circuit. The checks must be appropriate for the system configuration and the documentation for the specific model.
Do not arbitrarily add or discharge refrigerant merely to try to resolve the fault. All adjustments must have a technical basis and comply with the relevant refrigerant safety regulations.
Check the expansion valve and main PCB
If the previous steps have not identified the cause, continue checking the condenser-side expansion valve and main PCB in accordance with the manufacturer's diagnostic sequence. This step is necessary to avoid replacing components without confirmatory test results.
Perform a test run and verify the results
After addressing the verified cause, perform a test run in accordance with the manufacturer's procedure and check the operating condition. If the fault code continues to appear, record the data and continue diagnosis rather than assuming that the fault has been fully resolved.
Read More Daikin VRV Fault Code E2-1: Earth Leakage Current Fault Warning
Precautions When Addressing Liquid Line Stop Valve Check Faults
When the system reports E3-13, E3-14 or E3-15, do not replace the stop valve, sensor or PCB based solely on the displayed code. Follow the correct inspection sequence and identify the cause before carrying out repairs.
Electrical measurements and tests, work on the refrigerant circuit, or opening outdoor unit components must be carried out by qualified personnel in compliance with safety instructions. Do not apply a single pressure threshold, refrigerant charge or set of operating parameters to all VRV models.
If the fault recurs or the cause cannot yet be identified, consult the Service Manual for the specific equipment and carry out in-depth diagnosis.
HVAC Services at HRT
HRT provides HVAC system consulting, site surveys, design, equipment selection, installation, acceptance inspection, warranty and maintenance services.
For VRV systems experiencing faults, identifying the correct model, collecting operating information and assessing the current condition provide the basis for considering an appropriate technical solution. Businesses should provide fault codes, equipment information and repair history, if available, to support the assessment process.
Contact HRT to discuss your requirements and explore an HVAC solution suited to the building's current condition.
Read More How to Maintain a VRV Air Conditioning System Correctly
Conclusion
Fault codes E3-13, E3-14 and E3-15 on the Daikin VRV series covered in the technical documentation belong to the liquid line stop valve check fault group. To address them correctly, technicians need to identify the specific model and check the stop valve, high-pressure sensor, refrigerant condition, refrigerant circuit, expansion valve and PCB in sequence, following the manufacturer's instructions.
HRT provides HVAC system consulting, site surveys, design, equipment selection, installation, acceptance inspection, warranty and maintenance services, helping businesses assess their requirements and consider technical solutions suited to their buildings.
Contact Information
HRT Air Conditioning and Ventilation Company
Address: No. 9TT7 Foresa 7A Street, Tasco Eco-Urban Area, Xuân Phương Ward, Hà Nội City, Việt Nam
Hotline: 0916 181 080
Email: CEO@hrt.vn
Frequently Asked Questions About Fault Codes E3-13, E3-14, E3-15
What does fault code E3-13 mean on Daikin VRV?
In the Daikin VRV IV+ Heat Pump documentation, E3-13 belongs to the liquid line stop valve check fault group and corresponds to the main outdoor unit. The specific model must be verified before applying this information to the equipment in use.
How do E3-14 and E3-15 differ from E3-13?
In the configuration described in the VRV IV+ Heat Pump documentation, E3-14 corresponds to subsidiary outdoor unit 1 and E3-15 corresponds to subsidiary outdoor unit 2. The display format and applicability must be confirmed against the documentation for each equipment series.
Is fault E3-13 definitely caused by a closed stop valve?
No. The stop valve is an item that needs to be checked, but the cause may also involve the high-pressure sensor, refrigerant charge, non-condensable gases, moisture, circuit blockages, expansion valve or main PCB.
Should refrigerant be added when the system reports fault E3-13, E3-14 or E3-15?
Do not add refrigerant based solely on the fault code. Check the refrigerant circuit condition, determine the refrigerant charge in accordance with the technical procedure, and make adjustments only when justified.