Table of Content
The A1 error code on a Daikin air conditioner indicates a failure of the indoor unit control board (PCB).
This is one of the most serious indoor unit errors because the PCB is responsible for:
- controlling system operations
- processing sensor data
- communicating with the outdoor unit
If the board fails, the system cannot function properly.
If youβre not sure what the A1 error means in the bigger picture, you can check the full breakdown of all Daikin codes in our complete guide on Daikin Error Codes. It explains how different error groups work and helps you quickly identify whether your issue is electrical, refrigerant-related, or system-wide.
What causes Daikin A1 error
A1 is a specific hardware-related issue.
Electrical damage
- Power surge
- Voltage spikes
- Lightning or outages
PCB component failure
- Burnt circuits
- Aging components
- Manufacturing defects
Moisture or corrosion
- Water exposure
- High humidity
- Condensation inside unit
Wiring or connection issues
- Loose connectors
- Short circuits
Symptoms of A1 error
You will typically notice:
- AC not turning on
- No response from remote
- System stops completely
- Error appears immediately after startup
In many cases, the unit becomes fully non-functional.
How to fix Daikin A1 error
Step 1: Power reset
- Turn off power
- Wait 5 to 10 minutes
- Restart system
Rarely fixes A1, but worth trying.
Step 2: Check for obvious electrical issues
- Burnt smell
- Visible damage on board
- Tripped breakers
Step 3: Inspect wiring connections
- Loose cables
- Damaged wires
Only if you are comfortable opening the unit.
Step 4: Professional diagnosis
If A1 persists, the issue is almost always:
- faulty PCB
- internal electrical failure
This requires testing tools and board-level diagnostics.
Can you fix A1 error yourself
Short answer: no in most cases
You can:
- reset power
- check wiring
But you cannot:
- repair PCB circuits
- safely replace control boards without experience
This is a technician-level repair.
Repair cost for A1 error
| Repair Type | Cost |
|---|---|
| Diagnostic visit | $100β$200 |
| Minor wiring fix | $150β$300 |
| PCB repair | $300β$800 |
| PCB replacement | $400β$1200 |
In some cases, replacing the unit may be more cost-effective if the system is old
Is A1 error serious
Yes. This is a critical failure.
Unlike airflow or filter issues, A1 means:
- the system cannot operate safely
- internal electronics are compromised
Continuing to power the unit may cause further damage.
When to call a technician
Call immediately if:
- the system does not turn on
- the error appears instantly
- you suspect electrical damage
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