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Error code

Mitsubishi Electric SUZ code A7

For your safety

This fault is rated high and involves an area that affects personal safety. No remote repair or do-it-yourself instructions are given; do not use the appliance or try to open or repair it.

Hazard area: mains voltage and refrigerant gas circuit

Do not use the appliance and call an authorised service. If there is a risk to life, move to a safe place and see the emergency numbers.

The emergency numbers here are for Turkey. If you are outside Turkey, call your local emergency number.

All emergency numbers and province details

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

Meaning

NO ACK signal Common Transmitting side controller detects relation (1) abnormal if a message was transmitted but there is no reply (ACK) that a message was received. Transmitting side detects abnormality every 30 seconds, 6 times continuously. Note: The address and attribute displayed at remote controller is indicate the controller that did not reply (ACK). If displayed address or attribute is (2) outdoor unit, Indoor unit detects abnormality when indoor unit transmitted to outdoor unit and ther | If displayed address or attribute is (4) remote controller, indoor unit detects abnormality when indoor unit transmitted to remote controller and there was no reply (ACK). If displayed address or attribute is (5) FRESH MASTER, indoor unit detects abnormality when indoor unit transmitted to FRESH MASTER and there was no reply (ACK). If displayed address or attribute is (6) LOSSNAY. Indoor unit detects abnormality when indoor unit transmitted to LOSSNAY and there was no reply (ACK). If displayed a

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Possible causes

factors that have no with abnormality source. The unit of former address does not exist as address switch has changed while the unit was energized. Voltage drop and weak signal causing communication error, are caused by over-range transmission wire. • Maximum distance······ 656 ft [200 m] line.. • Remote controller 39 ft [12 m] Voltage drop and weak signal causing communication error are caused by type-unmatched transmission wire. Type····· With shield wireCVVS, CPEVS With normal wire (no shield)- VCTF, VCTFK, CVV CVS, VVR, VVF, VCT Diameter····1.25 mm2 [AWG16] or more Voltage drop and weak signal causing communication error are caused by over-numbered units. Accidental malfunction of abnormality-detected controller (noise, lightning surge) Defective of abnormality occurred controller Contact failure of transmission wire of outdoor unit or indoor unit Disconnection of transmission connector (CN2M) of outdoor unit Defective transmitting receiving circuit of outdoor unit or indoor unit During group operation with indoor unit of multi-refrigerant system, if remote controller transmit to indoor unit while outdoor unit power supply of one refrigerant system is turned off or within 2 minutes of restart, abnormality is detected. Contact failure of transmission wire of remote controller or indoor unit Disconnection of transmission connector (CN2M) of indoor unit Defective transmitting receiving circuit of indoor unit or remote controller During group operation indoor unit of multisys

Solution

Solution steps are not shared for faults that may be dangerous.

No do-it-yourself solution is given for this fault. For your safety, call an authorised service.