Error P1 on Daikin FDXS35F Portable 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 P1 on Daikin : Freeze protection activated. Follow the troubleshooting steps below to diagnose and fix this portable-ac issue. ## What Error Code P1 Means on a Daikin FDXS35F Error P1 on the Daikin FDXS35F window AC indicates the coil freeze protection has activated — the indoor evaporator coil temperature has dropped below the freezing threshold. Daikin window ACs cycle the compressor off when the coil temperature sensor detects the coil is close to freezing, to prevent ice build-up. P1 is most commonly caused by a dirty air filter restricting airflow, which causes the evaporator to supercool. When P1 appears, the Daikin portable ac pauses normal operation to protect internal components from potential damage. Not every P1 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 - P1 on display

• Ice visible on indoor coil or discharge pipes
• Water dripping inside the room ## Common Causes - Freeze protection activated ## Tools You May Need - vacuum cleaner or soft brush ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Switch to fan-only mode for 30 minutes to defrost the coil. | Coil defrosted — continue to step 2 if the issue persists. | | 2 | Remove and clean the air filter thoroughly. | Filter cleaned — continue to step 3 if the issue persists. | | 3 | Ensure no furniture or drapes block the front air inlet. | Airflow path clear — continue to step 4 if the issue persists. | | 4 | Restore cooling mode and monitor for P1 recurrence. | P1 resolved or persists — continue to step 5 if the issue persists. | | 5 | If P1 recurs after cleaning, low refrigerant charge is likely — contact a Daikin engineer. | Refrigerant check required — if the fault remains, contact a qualified technician. | ## Safety Precautions Do not operate the unit with ice on the coil. Switch to fan-only mode to defrost. The excess water from melting ice can damage electrical components in the unit if heavy. ## Estimated Repair Time and Difficulty Most portable ac error code P1 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 often should I clean the Daikin window AC filter? Every 2–4 weeks during summer use. A clogged filter is the single most common cause of P1 on window ACs. Q: Is ice on the window AC dangerous? Ice melting from the coil can drip inside the room and damage furniture or floors below the unit. Switch to fan-only mode immediately. Q: Will P1 clear itself? P1 clears when the coil defrosts and cooling mode is restarted with adequate airflow. However, if the root cause (dirty filter) is not fixed, P1 will return. ### Is it safe to keep using my Daikin with error P1? If error P1 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 portable-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 P1 on a Daikin ? Repair costs for error P1 on the Daikin portable-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 P1 mean on a Daikin portable-ac? Error code P1 on Daikin portable-ac models indicates Freeze protection activated. 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 P1? If error P1 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 portable-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 P1 on a Daikin ? Repair costs for error P1 on the Daikin portable-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 P1 mean on a Daikin portable-ac? Error code P1 on Daikin portable-ac models indicates Freeze protection activated. 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.