Applicable Systems
VRV IV-S
Symptoms
The Daikin outdoor unit displays error E1, indicating an outdoor unit PC board (control board) fault. The outdoor unit control board has malfunctioned and cannot control the system.
Possible Causes
- Control board (P board) hardware failure
- Signal interference corrupting board communication
- Power surge or voltage transient damaging board components
- Moisture or corrosion on the control board
Troubleshooting Steps
- Step 1: Power cycle the outdoor unit by switching off the breaker
Wait 5 minutes, then restore power; transient board faults may clear - Step 2: Check for loose wiring connections on the control board
All connectors must be fully seated; check for corrosion on terminals - Step 3: Verify power supply voltage at the outdoor unit terminals
Voltage must be within the rated range printed on the unit nameplate - Step 4: If E1 persists after power cycle, the control board needs replacement
Contact Daikin service for board replacement; include unit model and serial number
How to Reset
To reset: 1) Turn off power at the circuit breaker. 2) Wait 5 minutes. 3) Restore power. If E1 returns, the control board must be replaced by a qualified technician. Caution: Do not attempt to repair the control board internally - this voids the warranty and is a fire hazard.
Frequently Asked Questions
- Q: What causes E1 on Daikin outdoor units?
E1 indicates a control board (P board) fault. Common causes include power surges, moisture, component failure, or signal interference. Board replacement is typically required.
- Q: Can I reset E1 by pressing the reset button?
Daikin outdoor units do not have a user-accessible reset button for E1. The fault can only be cleared by cycling power. If the board is damaged, power cycling will not clear the error.
Source: Daikin Air Conditioner Fault Code Reference, Daikin China Official Website Service Section, Code E1
Category: HVAC Residential