Error E1 on Daikin FTXF35D Mini-Split | Causes & Fix

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• Source: Official Daikin service manual
• Reviewed by: Geo Technical Editorial
• Published: March 15, 2026
• Updated: March 15, 2026

Safety notice: Start with user-safe checks only. Do not open sealed refrigerant systems, inspect gas-train components, or work on energized high-voltage parts unless you are qualified to service this appliance.

Error E1 on Daikin : Outdoor PCB fault. Follow the troubleshooting steps below to diagnose and fix this mini-split issue. ## What Error Code E1 Means on a Daikin FTXF35D Error E1 on the Daikin FTXF35D indicates the outdoor unit PCB has detected a fault. Daikin uses E1 on the outdoor unit to signal a control board fault, similar to A1 on the indoor unit. Common causes include power surges, outdoor PCB component failure, or moisture ingress into the outdoor unit enclosure. E1 typically requires outdoor unit PCB replacement by a Daikin authorised engineer. When E1 appears, the Daikin mini split pauses normal operation to protect internal components from potential damage. Not every E1 fault requires a professional engineer — many are resolved through careful inspection and routine maintenance. Work through each diagnostic step below in sequence, starting with the simplest check, to identify the root cause efficiently before considering part replacement or arranging a service call. ## Symptoms - E1 on display

• System does not start
• Outdoor unit does not energise when commanded ## Common Causes - Outdoor PCB fault ## Tools You May Need - Phillips screwdriver ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Isolate AC at circuit breaker. Wait 5 minutes. Restore power. | Power cycled — continue to step 2 if the issue persists. | | 2 | If E1 clears and system operates, fault was transient. | Fault transient or persists — continue to step 3 if the issue persists. | | 3 | If E1 recurs: isolate outdoor unit and remove the service panel. | Outdoor unit panel removed — continue to step 4 if the issue persists. | | 4 | Inspect PCB for moisture, burn marks, or swollen capacitors. | PCB inspected — continue to step 5 if the issue persists. | | 5 | Contact Daikin engineer for PCB replacement. | Engineer engaged — if the fault remains, contact a qualified technician. | ## Safety Precautions The outdoor unit PCB operates at mains voltage. Do not access the outdoor unit electrical compartment without isolating power at the outdoor unit isolator and the main circuit breaker. ## Estimated Repair Time and Difficulty Most mini split error code E1 faults can be assessed and addressed in 30–90 minutes using the steps above. The diagnostic process requires only basic tools: a multimeter and standard screwdrivers cover the majority of checks described here. If a replacement part is required, allow 1–5 working days for delivery. A trained technician with access to the correct diagnostic equipment will typically resolve this type of fault within a single service visit. ## When to Call a Technician Contact a Daikin authorised service technician if: the fault persists after following all the steps above; if PCB-level or refrigerant-circuit work is required; or if you are not comfortable working with electrical or mechanical components. When calling, have the full model number, the error code displayed, and a brief description of any sounds or symptoms you noticed before the fault appeared — this helps the technician prepare the correct parts and tools. ## Frequently Asked Questions Q: Can rain cause E1 on the outdoor unit? Yes — water ingress through damaged weatherproof seals can cause outdoor PCB faults. Check that all outdoor unit covers and conduit seals are intact. Q: Is E1 safe to ignore temporarily? Only if the system is not needed — E1 prevents the unit from starting. In hot weather, prolonged E1 can affect building comfort. Q: How long does outdoor PCB replacement take? An authorised engineer typically completes outdoor PCB replacement in 1–2 hours for standard models. ### Is it safe to keep using my Daikin with error E1? If error E1 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the mini-split with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error E1 on a Daikin ? Repair costs for error E1 on the Daikin mini-split depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Daikin-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E1 mean on a Daikin mini-split? Error code E1 on Daikin mini-split models indicates Outdoor PCB fault. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue. ### Is it safe to keep using my Daikin with error E1? If error E1 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the mini-split with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error E1 on a Daikin ? Repair costs for error E1 on the Daikin mini-split depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Daikin-authorized service provider for an accurate estimate based on your specific situation. ### What does error code E1 mean on a Daikin mini-split? Error code E1 on Daikin mini-split models indicates Outdoor PCB fault. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.