Knowledge/Fault finding/Daikin fault codes: how they're built, and where to look them up
Daikin fault codes: how they're built, and where to look them up
Daikin codes work like a grid, not a list. The letter tells you which part of the system has the fault, and the digit after it gives the detail. There are 107 codes across Daikin's RA, SkyAir, VRV, PA and Heat Reclaim Ventilator ranges. The letter alone tells you where to look, and that's often enough to start.
- Total codes
- 107across five product ranges
- How it's built
- Letter plus digitpart of the system, then detail
- A, C, E
- Indoor, sensor, outdoorthree letters worth knowing
- Where to look up
- Daikin's own toolnot someone else's chart
What does the first letter of a Daikin code tell you?
| Letter | Part of the system |
|---|---|
| A | Indoor unit |
| C | Sensor |
| E | Outdoor unit |
| F, H, J, L | Inverter system |
| M, P, U | System and communications |
This is the bit worth memorising, because it works without a lookup. A code starting with E is outdoor. A code starting with A is indoor. A code starting with U is communications or system. On a callout where you can read the display but don't have the manual, that narrows the job straight away.
The full set of 107 codes runs from A0 to UP.
Which seven codes could we confirm from more than one source?
| Code | Meaning |
|---|---|
| U0 | Refrigerant shortage |
| U4 | Indoor to outdoor communication failure |
| A5 | Freeze-up protection in cooling, or high pressure control in heating |
| A6 | Indoor fan motor |
| E3 | High pressure too high (HPS, the high pressure switch) |
| E7 | Outdoor fan motor |
| H6 | Position sensor abnormality |
U0 and U4 are the two worth knowing by heart. U4 in particular is a communications fault rather than a failed component, so it points you at the interconnect and the communications cable before anything else.
Seven,
not
107
Why we haven't published all 107 meanings
The chart we worked from has instructions printed over the top of the grid, so we couldn't reliably tell which meaning goes with which code. We could read the 107 codes and the grid layout with confidence. We couldn't read which meaning sat in which cell.
We could have filled in a full-looking table by guessing the cells. On a fault code page that sends a technician to the wrong component, which is worse than an incomplete page.
Use Daikin's own Error Code Search tool for the meanings. It's the authority, it's public, and it's current. We're also not reproducing anything from behind the Daikin Australia customer portal, which is where the Australian service manuals sit.
Does every Daikin range use every code?
No. It's one grid, but RA, SkyAir, VRV, PA and Heat Reclaim Ventilator each use only some of the codes, and how you pull a code up depends on the controller.
So the code you're reading might not exist on the range you're standing in front of. And getting it out of the machine works differently on a wired controller than on a wireless remote in inspection mode.
VRV also has its own warranty card, separate from the rest of the range. Worth knowing if the fault turns into a claim.
Had a fault that didn't make sense?
The ones worth talking about are the ones where the code pointed one way and the cause turned out to be somewhere else entirely.
Send it through. If enough people have hit the same thing it becomes a page.
Who this is for: small and medium HVAC contractors in Victoria. If you're a homeowner after a rebate or a repair, you need a licensed contractor, not us, and yours can point you the right way.
Related
- Which brands publish their fault codes, and which don'tSome manufacturers put the whole service library online with no login. Others publish nothing you can actually open. That changes how long a fault takes.
- Reading Braemar ICS fault codes off the board LEDsGreen flashes count tens, red flashes count ones. Plus the three lockout levels, the service PIN, and the order of checks that finds the real cause.
- Most overheat faults are airflow, not gasBrivis codes 40 to 43 and 53, and Braemar FC10 and FC19, most often come down to restricted airflow. Here's the order I'd check it in.
- Seeley evaporative fault codes, FC01 to FC09All six public codes, which models each one applies to, how to read the LEDs, and Seeley's own warning about using the wrong code table.
Review date: 1 April 2027. Figures in this area change without much notice and this page carries some that will go stale. Every number above is dated and sourced so you can check it yourself. If you find something out of date here, tell us and we will fix it.