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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Mitsubishi Ecodan & Daikin Altherma Fault Codes / Error Codes

Caution Be sure to turn off power switch before connecting or disconnecting connector, otherwise parts may be damaged. During this operation, instead of showing the water temperature set point, the controller shows the shift value which can be set by the user.

To avoid compressor breakdown. The capacitors top surfaces can hold up to V.

Flow switch activated, water flow rate too low or blocked inlet strainer 80 Indoor unit LT: Be sure to discharge the capacitor completely before conducting repair work. Before shipping, the set values have been set as shown in the field settings table. YES Disconnect the connection between the compressor codde inverter.

Using 2-remote controls control. Both levels level 2 and level 3 are basically the same, the only difference is that for level 3 no water codde settings are possible see table below. NO Is indoor outdoor transmission wiring normal?


YES Check for the points shown below.

Do not tilt the coee when removing it. Therefor multiple set point pattern A can be configured to allow simultaneous domestic water and space heating without intermission. To resolve the error codes, see “Error codes”. Coil check method for the moving part of the electronic expansion valve Discount the caikin expansion valve from the PC board and check the continuity between the connector pins.

Inverter Start up Error INV max upper limit frequency: In this case, the unit cannot be run for up to 12 minutes to automatically set the address indoor-outdoor address, etc. The prohibited item or action is shown inside or near the symbol. Reheat operation When requesting space heating and domestic water heating reheat at the same time.

The refrigerant gas can cause frostbite. NO Check and see whether compressor is short-circuited or ground. RA GWP 1 value: Malfunction Decision Conditions When a short circuit or an open circuit in the heat exchange thermistor is detected. I want to encourage one to continue your great posts, have a nice evening! It can also be stopped manually by pushing the w button.

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Unit is working in space heating mode but 3-way valve is positioned in DHW mode right instead of left position. YES Connect the connector. NO Disconnect the connection between the compressor and inverter. The water flow is too low. Malfunction Decision Conditions When an excessive current flows in the power transistor.

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Malfunction Decision Conditions When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power supply voltage are detected. The heated water is stored at a higher temperature so it can fulfill the domestic hot water requirements throughout the day. Room temperature and leaving water temperature have no fix relationship. Outline of Control Indoor Unit 6.

Low pressure drop due to refrigerant shortage or electronic expansion valve failure RA. Are the characteristics of the low pressure sensor normal?

Malfunction Decision Conditions When the leaving water temperature thermistor becomes disconnected or shorted while the unit is running.