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The latest industry insights from the pros at AirReps.
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Bleeding By Daikin VRV EEVs
What does A9-02 mean? Whenever working on any Daikin VRV system, there is always a possibility of generating an A9-02 error code. This code indicates that an indoor fan coil is experiencing refrigerant bleed-by. In this instance liquid refrigerant is passing through the indoor unit and returning back to the compressor, which can lead to potential damage if not addressed. Why is an A9-02 error code bad for a system? Why is liquid bad for...
Ivan Balbuena
June 8, 2026
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Daikin VRV
Bleeding By Daikin VRV EEVs
What does A9-02 mean? Whenever working on any Daikin VRV system, there is always a possibility of generating an A9-02 error code. This code indicates that an indoor fan coil is experiencing refrigerant bleed-by. In this instance liquid refrigerant is...
Daikin VRV
VRV System Not Communicating? Here’s What We Check First
Whether the system is missing indoor units, throwing U4 alarms, or not seeing devices correctly, the issue is usually related to communication wiring, addressing, or controller setup. Before getting too deep into troubleshooting, we typically start by verifying the communication...
Daikin VRV
Understanding the U4 Error Code in Daikin VRV Systems
Understanding the U4 Error Code in Daikin VRV Systems If you’re seeing a U4 error code on your Daikin Variable Refrigerant Volume (VRV) system, you’re dealing with a communication issue that needs prompt attention. This error is one of the most common diagnostic codes...
Daikin VRV
Daikin VRV, A2L requirements, 2021 IMC, and ASHRAE 15
Our team of HVAC experts at AirReps has now been through several Daikin VRV projects across Washington under A2L requirements, and the process is starting to become more consistent. The code framework itself, including the 2021 IMC and ASHRAE 15, is well established. What has taken...
Velo
Stabilizing Performance and Reducing Swing Tank demand with the new generation of Domestic HWHPs
As the era of decarbonization brings focus to the domestic hot water production of buildings, heat pumps have become the leading technology utilized to achieve this goal with great success. Fossil fuels can be removed from systems and high COPs can be achieved, even as...
ONICON Insertion Turbine Meter
ONICON Insertion Turbine Meter Diagnostics
Here at AirReps, our team of HVACR experts hears it all! We’re always answering questions about HVACR systems that are facing issues in running properly. Every so often we get a call from a customer wondering why their turbine meter...
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