Error E3 on Daikin FTXM35R Heat Pump | 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 E3 on Daikin : High pressure fault. Follow the troubleshooting steps below to diagnose and fix this heat-pump issue. ## What Error Code E3 Means on a Daikin FTXM35R Error E3 on the Daikin FTXM35R indicates the outdoor unit high-pressure protection has activated. Daikin systems have a high-pressure switch in the refrigerant circuit that opens if pressure exceeds safe limits. In cooling mode, the most common cause is a dirty outdoor condenser coil or restricted outdoor unit airflow. In heating mode (heat pumps), a dirty indoor coil or restricted indoor airflow can cause high-pressure trips. When E3 appears, the Daikin heat pump pauses normal operation to protect internal components from potential damage. Not every E3 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 - E3 on display

• System cuts out during cooling or heating
• Outdoor unit very hot; outdoor fan running fast ## Common Causes - High pressure fault ## Tools You May Need - soft brush or low-pressure garden hose ## Step-by-Step Repair Guide | Step | Action | Result | |------|--------|--------| | 1 | Isolate AC. Inspect outdoor unit condenser coil for debris, dirt, or blockage. | Coil inspected — continue to step 2 if the issue persists. | | 2 | Clean coil fins with a soft brush. Rinse with low-pressure water if heavily soiled. | Coil cleaned — continue to step 3 if the issue persists. | | 3 | Ensure outdoor unit has minimum 30 cm clearance on all sides and 150 cm above. | Clearance confirmed — continue to step 4 if the issue persists. | | 4 | Restore power and test cooling. | E3 resolved or persists — continue to step 5 if the issue persists. | | 5 | If E3 persists after cleaning, Daikin engineer required for refrigerant and pressure switch check. | Engineer required — if the fault remains, contact a qualified technician. | ## Safety Precautions Isolate the AC before cleaning the outdoor unit. Never use high-pressure water on the outdoor electrical enclosure. ## Estimated Repair Time and Difficulty Most heat pump error code E3 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 blocking the outdoor unit with a cover cause E3? Yes — outdoor unit covers that restrict airflow are a common cause of E3. Never cover the outdoor unit during operation. Q: Will E3 damage the compressor? The high-pressure switch protects the compressor. However, repeated E3 cycles without resolving the root cause can stress the compressor over time. Q: Does E3 require a refrigerant recharge? Not usually — E3 is typically caused by restricted airflow, not refrigerant charge. An engineer should assess the refrigerant charge only if cleaning does not resolve E3. ### Is it safe to keep using my Daikin with error E3? If error E3 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 heat-pump 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 E3 on a Daikin ? Repair costs for error E3 on the Daikin heat-pump 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 E3 mean on a Daikin heat-pump? Error code E3 on Daikin heat-pump models indicates High pressure 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 E3? If error E3 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 heat-pump 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 E3 on a Daikin ? Repair costs for error E3 on the Daikin heat-pump 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 E3 mean on a Daikin heat-pump? Error code E3 on Daikin heat-pump models indicates High pressure 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.