Below are some common fault codes for Mitsubishi Ecodan and Daikin Altherma air to water heat pumps. If you need help interpreting the error code or fixing.

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Even if stop operation is carried out, coode contents are displayed when the inspection mode is entered. Verify if the hydrobox althedma out the right signal to the 3-way valve see page This post couldn’t be written any better! Be sure to turn off the power switch and unplug the power cable when cleaning the equipment.

The filled out label must be adhered in the proximity of the product charging port e. Corroded installation platform or frame can cause the unit to fall, resulting in injury.

Pressing the z button, without pressing the pr button before, will discard the change made. These sounds are produced when the Normal operation. For integral units only If the packing and seal are not installed properly, water can enter the room and wet the furniture and floor. If L2 or Phase N is open, replace the switch box.

Mitsubishi Ecodan & Daikin Altherma Fault Codes / Error Codes

Even if all schedule timers are de-activated and there is no reheat function active, the disinfection function will operate if a domestic hot water tank is installed and field setting [] is set to ON.


If there are misconnections or malfunctions, an error code will be displayed on the user interface. NO Replace the thermistor R6T.

Type of nonvolatile memory.

Are indoor – outdoor transmission wiring and QA wiring normal? Malfunction Decision Conditions When number of turns cannot be sefaut even when output voltage to the pump motor is maximum.

External factor other than malfunction for example, noise etc.

Daikin Altherma HT Service manual |

Make sure to use nitrogen gas. Be aware that despite the automatic storage is a pre-programmed schedule timer, it is only active when the schedule timer is enabled. The 3-way valve motor is incorrectly wired to the indoor unit. I will forward this write-up to him. Make sure the domestic hot water is not heated unnecessary. I have been tiny bit familiar of this your broadcast provided vivid clear idea. The prohibited item or action is shown inside or near the symbol.

Printed circuit board defect E Indoor unit HT: These symptoms lapse of five minutes. This function can only be activated by the schedule timer button and this icon should be led. Damaged cable and wires can cause an electrical shock, excessive heat generation or fire. Do not forget to restore the field setting [E] to the default value when commissioning is finished!


Used at field set. Do not install the equipment in a place where there is a possibility of combustible gas leaks.

Value of compressor port altheerma calculated by Tc and Te, and suction superheated degree. If the refrigerant gas discharges during the repair work, do not touch the discharging refrigerant gas.

sianglag – Code defaut daikin altherma pdf

Supposed Cause Blowout of fuse s Cutout of breaker s Countermeasure Turn Off the power supply and then replace the fuse s. If OFF instruction is active this will have priority over the setback function. The schedule timer does not work but Check if the clock and the day of the the althrema actions are executed week are set correctly, correct if at the wrong time.

The 3-way daikln will switch back to space heating mode for the interval period setting [d]. To avoid compressor breakdown.