Error E5 on Daikin DW12AAVS Window AC | 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 E5 on Daikin : Compressor fault — not starting or overcurrent. Follow the troubleshooting steps below to diagnose and fix this window-ac issue. ## What Error Code E5 Means on a Daikin DW12AAVS Error E5 on the Daikin DW12AAVS window AC indicates the compressor has drawn excessive current or failed to start. On window ACs, E5 typically indicates a compressor start relay failure, a failed run capacitor, or a seized compressor motor. A failed capacitor is the most common cause and is an inexpensive, accessible repair. When E5 appears, the Daikin window ac pauses normal operation to protect internal components from potential damage. Not every E5 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 - E5 on display

• Compressor hum but no cooling
• Unit starts fan but compressor does not run ## Common Causes - Compressor fault — not starting or overcurrent ## Tools You May Need - digital multimeter (capacitance mode)
• replacement run capacitor ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Unplug AC. Access the rear section by removing the outer casing. | Casing removed — continue to step 2 if the issue persists. | | 2 | Locate the compressor run capacitor (cylindrical component near the compressor). | Capacitor located — continue to step 3 if the issue persists. | | 3 | Test capacitor in capacitance mode — rated value is printed on the capacitor. Below 80% of rated = failed. | Capacitance measured — continue to step 4 if the issue persists. | | 4 | Replace capacitor if failed. | Capacitor replaced — continue to step 5 if the issue persists. | | 5 | Restore power and test cooling. | E5 cleared — if the fault remains, contact a qualified technician. | ## Safety Precautions Unplug the AC and wait 5 minutes before accessing the capacitor. Capacitors store a dangerous charge — discharge by briefly touching both terminals with an insulated screwdriver before handling. ## Estimated Repair Time and Difficulty Most window ac error code E5 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: How do I know if the capacitor is faulty without a meter? A visually bulging or leaking capacitor is definitely failed. However, a failed capacitor can look normal externally — always test with a meter. Q: Can a failed capacitor cause damage? Yes — running with a failed capacitor causes the compressor motor to draw excessive current and overheat. Replace promptly. Q: Is capacitor replacement a DIY repair? Yes, with basic electrical knowledge. Always unplug the AC and discharge the capacitor before handling (touch both terminals with an insulated screwdriver). ### Is it safe to keep using my Daikin with error E5? If error E5 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 window-ac 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 E5 on a Daikin ? Repair costs for error E5 on the Daikin window-ac 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 E5 mean on a Daikin window-ac? Error code E5 on Daikin window-ac models indicates Compressor fault — not starting or overcurrent. 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 E5? If error E5 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 window-ac 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 E5 on a Daikin ? Repair costs for error E5 on the Daikin window-ac 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 E5 mean on a Daikin window-ac? Error code E5 on Daikin window-ac models indicates Compressor fault — not starting or overcurrent. 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.