Error E1 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 E1 on Daikin : Room temperature sensor fault. Follow the troubleshooting steps below to diagnose and fix this window-ac issue. ## What Error Code E1 Means on a Daikin DW12AAVS Error E1 on the Daikin DW12AAVS window AC indicates the room temperature sensor (NTC thermistor) is faulty. The room temperature sensor is mounted near the air inlet on the front panel and is used by the thermostat to control cooling output. If the sensor reads open-circuit or short-circuit, the control board cannot regulate room temperature and raises E1. On most Daikin window units, the room temperature sensor is a small NTC clip mounted inside the front air intake grille. When E1 appears, the Daikin window ac 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

• Cooling output erratic
• Unit runs continuously or shuts off too early ## Common Causes - Room temperature sensor fault ## Tools You May Need - digital multimeter
• Phillips screwdriver ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Unplug the AC. Remove the front panel. | Panel removed — continue to step 2 if the issue persists. | | 2 | Locate the room temperature NTC sensor near the air inlet. | Sensor located — continue to step 3 if the issue persists. | | 3 | Test NTC resistance: at 25 °C expect ~10 kΩ. | Resistance measured — continue to step 4 if the issue persists. | | 4 | Replace NTC if OL or 0 Ω. | NTC replaced — continue to step 5 if the issue persists. | | 5 | Refit panel, restore power, and test thermostat function. | E1 cleared — if the fault remains, contact a qualified technician. | ## Safety Precautions Always unplug the window AC before accessing any internal sensors. Window AC units are not easily isolatable by a wall switch — unplug the power cord. ## Estimated Repair Time and Difficulty Most window ac 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: Will E1 cause the unit to run constantly? Depending on the default the board uses when E1 is active — some units run at maximum cooling, others shut down. Check your model’s behaviour. Q: Is the room NTC the same as the coil NTC? No — E1 is the room air temperature sensor; E2 is the coil temperature sensor. They are separate components. Q: Can a partially blocked grille cause E1? No — E1 is a sensor component failure, not a temperature alarm. Grille blockage would affect cooling performance but not trigger E1. ### 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 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 E1 on a Daikin ? Repair costs for error E1 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 E1 mean on a Daikin window-ac? Error code E1 on Daikin window-ac models indicates Room temperature sensor 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 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 E1 on a Daikin ? Repair costs for error E1 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 E1 mean on a Daikin window-ac? Error code E1 on Daikin window-ac models indicates Room temperature sensor 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.