Daikin FTXM35R Error A6: Diagnosis and Effective Solutions

⚠️ SAFETY WARNING / SERIOUS RISK. This air conditioner operates with 230V mains voltage and high residual DC voltages (up to 340V DC) on the electronic board, in addition to containing fluorinated refrigerant gas. Any electrical or mechanical intervention requires disconnecting the dedicated general miniature circuit breaker. DIY repair is extremely dangerous and prohibited by law (F-Gas regulation and DM 37/08). ReeFix provides this diagnosis for informational purposes only.

OBSERVED SYMPTOMS

The Daikin FTXM35R device displays error code A6. This specifically indicates an anomaly in the indoor unit's fan motor. The self-diagnosis system detects a mechanical blockage, an overcurrent, or the absence of the tachometric feedback signal from the motor itself. The indoor unit ceases to function correctly, not delivering airflow.

WHAT TO RULE OUT

• Outdoor unit problems: Error A6 is intrinsically linked to the indoor unit. If the outdoor unit seems to be working (e.g., compressor starts), the problem does not lie there.
• Lack of refrigerant: If the error were related to gas pressure, a different code would be indicated (e.g., E5, H0).
• Defective remote control: The problem is not with the command, but with the execution of the command.
• Clogged air filters (as a primary cause): Although excessively dirty filters can reduce airflow, they rarely cause a motor blockage severe enough to directly generate A6, unless a critical mass of dirt has formed on the fan itself.

FINAL CAUSE

The diagnosis for error A6 on the Daikin FTXM35R focuses on the indoor unit's motor/fan assembly and its control electronics. The BLDC (Brushless Direct Current) motor requires constant feedback to the microprocessor to operate. The absence or anomaly of this signal, or an impediment to rotation, activates the A6 protection.

1. Internal fault in the Daikin FTXM35R Indoor Fan Motor (windings, sensors, or integrated electronics) — 60-75%
   • Key signals: The tangential fan rotates freely if moved manually when the machine is off, but the motor does not start or maintain rotation when the unit is on. Power supply voltages (Vm and Vcc) are present and stable on the motherboard connector, but the motor does not respond or does not generate the feedback signal (FG). Often, an internal component of the BLDC motor, such as Hall effect sensors or the integrated drive circuit, has failed.

In many cases, before error A6 becomes permanent, you might notice the fan spinning very slowly or intermittently. This abnormal behavior confirms that the motor is losing its internal synchronization signal and needs to be replaced.

*   **Quick checks:** With the machine disconnected, try to spin the fan by hand. If it is free, reconnect and, with a professional multimeter, check for the presence of Vm (~280-340V DC) and Vcc (15V DC) voltages on the connector on the motherboard side that powers the motor. If present, the fault is in the motor.
*   **Estimated cost:** Replacing the [Daikin FTXM35R Indoor Fan Motor](https://www.ebay.it/sch/i.html?_nkw=Daikin+FTXM35R+Indoor+Fan+Motor&mkcid=1&mkrid=724-53478-19255-0&siteid=101&campid=5339148621&toolid=10001&mkevt=1) (spare part + labor) can range from 180 to 350 euros. This is the most common case, and repair is almost always cost-effective.

2. Malfunction of the Daikin FTXM35R Indoor Unit Electronic Board (IPM drive circuit) — 20-25% * Key signals: The unit does not provide the correct voltages to the motor. Measuring on the motherboard connector, the absence of Vm or Vcc voltage is detected, or the speed command signal (Vsp, 0-6V DC) is absent or anomalous. The IPM power module or filter capacitors on the board are often responsible. * Quick checks: Disconnect the motor and, with a Professional Digital Multimeter, measure the voltage outputs directly on the motherboard pins during power-on. If Vm or Vcc voltages are absent or unstable, the board is compromised. * Estimated cost: Replacing the Daikin FTXM35R Indoor Unit Electronic Board is more expensive, from 250 to 500 euros. Even in this case, repair is often justified.

3. Mechanical obstruction or wear of fan bearings/bushings — 5-10%

   • Key signals: Unusual noise (squealing, creaking) before blockage, or tangible resistance when attempting to manually rotate the fan. Excessive accumulation of dirt and mold on the tangential fan can weigh it down, or the motor bearings/idler support bushing are worn.
   • Quick checks: With the machine off and disconnected, manually rotate the fan drum. If you feel sticking, friction, or if the fan does not spin freely by inertia, there is a mechanical problem. Also inspect the support bushing on the opposite side of the motor.
   • Estimated cost: Cleaning and lubrication are low-cost interventions (50-100 euros, if it does not require complex disassembly). Replacing bearings or bushings, if possible, falls within a similar range.

4. Unstable connector or broken wiring — <5%

   • Key signals: The error occurs intermittently, especially after unit vibrations or maintenance interventions. A damaged wire or an oxidized connector prevents proper communication between the board and the motor.
   • Quick checks: Visually inspect the wiring between the motor and the board. Disconnect and reconnect the motor connector, possibly using a Dry Electrical Contact Cleaner.
   • Estimated cost: Low (0-50 euros), often solvable with simple repositioning or cleaning.

Real micro-case: Often, in units installed in humid environments or with poor maintenance, the accumulation of a gelatinous film of mold and dust on the tangential fan drastically increases its weight and friction, simulating an electrical fault and activating A6. A deep cleaning, performed by a technician, solves the problem.

Operational decision: If the fan rotates freely by hand, but the motor does not start and Vm and Vcc voltages are present on the connector, contact a technician for the replacement of the Daikin FTXM35R Indoor Fan Motor; if Vm or Vcc voltages are absent, a fault in the Daikin FTXM35R Indoor Unit Electronic Board is likely, requiring professional intervention.