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Error code

Mitsubishi Electric CMB code 2502

No approved translation for this record yet; showing the original text.

Meaning

Drain pump fault (Models with a drain sensor): 1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water. This condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode. 2) If another episode of the above condition is detected during the preliminary error, this is considered a drain pump error, and "2502" appears on the monitor. 3) This error is always detected while the drain pump is in operation. 4) The following cr | Drain pump fault (Models with a float switch): 1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water. Sensor in the air When it is detected that the float switch has been OFF for 15 seconds, it is interpreted that the sensor tip is not immersed in water. 2) If it is detected that the float switch has been ON for 3 minutes after the immersion of t

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Possible causes

(1) Drain pump failure (2) Drain water drainage problem Clogged drain pump Clogged drain piping (3) Adhesion of water drops to the drain sensor 1) Trickling of water along the lead wire (2) Rippling of drain water caused by filter clogging (4) Indoor unit control board failure Drain pump drive circuit failure Drain heater output circuit failure (5) Items (1) through (4) above and an indoor unit electronic valve closure failure (leaky valve) occurred simultaneously. (3) Stuck float switch Check for slime in the moving parts of the float switch. (4) Float switch failure (5) Indoor unit/HBC controller control board fault Drain pump drive circuit failure Float switch input circuit failure (6) Items (1) through (5) above and an indoor unit electronic valve closure failure (leaky valve) occurred simultaneously. (7) Untightened manual air vent valve

Solution

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