Daikin Error Code U2: Troubleshooting and Repair Guide
The Daikin U2 error code either means an insufficient (or instantaneous failure in the) power supply or a fault in the indoor and outdoor unit communication line (if you have a split-type air conditioning system). But if it is the latter case, the cause of the U2 error could be PCB damage or a defect in the wiring and contact terminals in the circuit board. Either way, the starting price of replacing a damaged outdoor PCB is $250 while that for an indoor PCB is $150. However, actual pricing depends on the aircon model you are using.
If your Daikin air conditioner gives you the U2 error code, there is a good chance you might be able to address the issue easily at home. But ignoring it is not an option. Because a U2 error, if left unresolved, can disrupt cooling performance, cause intermittent shutdowns, or even prevent the system from starting.
At Silverback Aircon, we have a long experience in diagnosing and clearing Daikin error codes with precision. This in-depth guide explains the meaning of the U2 error, how to identify it, effective troubleshooting steps, and estimated repair costs to help restore your aircon’s functionality.
Table of Contents
- What is Daikin U2 error?
- How to find the Daikin U2 error code?
- Daikin aircon error code U2 troubleshooting and solution
- Estimated cost of fixing a Daikin U2 error
- Conclusion
What is Daikin U2 Error?
The Daikin U2 error code indicates an issue with the power supply voltage or communication link between the indoor and outdoor units. The system monitors voltage stability and signal transmission to ensure smooth operation. When irregularities occur, the U2 error appears to prevent potential widespread damage to the aircon system.
- 📌 Voltage fluctuations from unstable power supply or electrical surges.
- 📌 Loose or damaged wiring in the communication cables connecting the indoor and outdoor units.
- 📌Faulty PCB (printed circuit board) disrupting signal transmission.
- 📌 Power supply issues such as low voltage, brownouts, or incorrect phase connections.
- 📌 Interference from nearby electrical devices disrupting communication signals.
How to find the Daikin U2 error code?
To check for an E9 error in your Daikin air conditioning system, use your aircon remote control and make sure that it is set to display the indoor temperature settings. For the E9 code to display, you will need to first press the timer’s cancel button for at least five seconds. You’ll hear a long beep, after which you’ll see that the temperature display has changed to reflect the E9 error code. Once confirmed, proceed with troubleshooting or contact a professional technician for accurate diagnosis.
Daikin aircon error code U2 troubleshooting and solution
1. Power Reset the Air Conditioner
A temporary electrical glitch may trigger the U2 error. Turn off the unit at the main power switch, wait 10-15 minutes, then restart. If the error disappears, the issue may have been a minor voltage fluctuation.
2. Check Power Supply Stability
Ensure the aircon receives stable voltage within the required range which is between 200V–240V in Singapore. Use a multimeter to verify voltage levels at the power outlet. If readings are inconsistent, consult an electrician to inspect the building’s wiring.
3. Inspect Communication Wiring
The indoor and outdoor units of your Daikin air conditioning system communicate via control cables. So, check for any loose jacks or disconnected wires at terminal connections, as well as damaged or frayed cables that may disrupt signals, and corrosion or moisture affecting wire conductivity. Re-secure loose connections and replace damaged wiring if necessary.
4. Check the PCB of your aircon.
A faulty PCB can cause communication failures. Look for burnt components or discolored circuits, loose connectors or solder cracks, and error codes persisting after a reset. If the PCB appears damaged, professional repair or replacement is the only solution.
5. Eliminate Electrical Interference.
Nearby appliances like inverters, heavy machinery, or power generators can disrupt communication signals. Relocate the aircon’s wiring away from potential interference sources.
When to Call Silverback:
If basic troubleshooting doesn’t resolve the U2 error, a certified technician should:
- ✔️Diagnose and stabilize power supply issues.
- ✔️Replace damaged communication wiring.
- ✔️Repair or replace a faulty PCB.
- ✔️Verify refrigerant and compressor operation if linked to voltage problems.
Note that DIY repairs on electrical components can be hazardous. Always, trusting a professional ensures safety and long-term reliability.
Estimated cost of fixing a Daikin U2 error
Repair costs vary depending on the root cause of the U2 fault. And here at Silverback Aircon, we offer transparent pricing and expert solutions to ensure your Daikin air conditioner operates efficiently. So here’s a table covering the possible scenarios for a U2 error and the cost of fixing them, as well as the prices of aircon spare parts that might be needed.
| Service Required | Cost From |
| Outdoor PCB (for system 1 sky series) | $250 |
| Indoor PCB (for system 1 9k btu) | $150 |
| Communication cable replacement and electrical inspection | WhatsApp Quote |
Conclusion
All in all, the Daikin U2 error code indicates power supply or communication issues that require immediate attention. While simple fixes like power cycling or checking connections may help, persistent errors demand professional diagnosis. If your Daikin aircon displays the U2 error, Silverback Aircon provides reliable troubleshooting and repair services in Singapore. Contact us over Whatsapp for a free consultation as well as to get a quote on the possible cost of repairs.
