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D
a1
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Daikin · Mini-Splits & Ductless Systems
Indoor PCB Defective
Quick Answer
Error code A1 on your Daikin Mini-Splits & Ductless Systems means: Indoor PCB Defective. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
FTXB12KVJUFDMQ09RVJUFTXB12AXVJUMXS48TVJURXL12QMVJUFTXS12LVJUFTKB09TVJU
Likely Causes
  1. Main processor on indoor printed circuit board has failed
  2. Power surge or lightning damage to indoor electronics
  3. Component failure on the PCB due to age or heat stress
  4. Moisture ingress into the indoor unit control board housing
How to Fix It
1
Power cycle the unit by turning off the circuit breaker for 60 seconds and restoring power
2
Check for any signs of burn marks, bulging capacitors, or corrosion on the indoor PCB
3
Verify input voltage to the indoor unit is within specification (208-230VAC)
4
If the error returns after power cycling, the indoor PCB requires replacement
5
Indoor PCB replacement must be performed by a licensed HVAC technician familiar with Daikin systems
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Indoor PCB assembly
PCB mounting screws
Wire connectors
Related Error Codes
A3A5A6A7C4
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