Error code

Mitsubishi Electric PUHZ 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 1. Transmitting side controller detects 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 indicate the controller that did not reply (ACK). 2. If displayed address or attribute is outdoor unit, indoor unit detects abnormality when indoor unit transmits signal to outdoor unit and there was no reply ( | 4. If displayed address or attribute is remote controller, indoor unit detects abnormality when indoor unit transmits signal to remote controller and there was no reply (ACK). 5. If displayed address or attribute is FRESH MASTER, indoor unit detects abnormality when indoor unit transmits signal to FRESH MASTER and there was no reply (ACK). 6. If displayed address or attribute is LOSSNAY, indoor unit detects abnormality when indoor unit transmits signal to LOSSNAY and there was no reply (ACK). 7.

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Possible causes

Common factor that has no relation with abnormality source (1) The unit of former address does not exist as address switch has changed while the unit was energized. (2) Extinction of transmission wire voltage and signal is caused by over-range transmission wire. distance.......200 • Maximum m line..(12 • Remote controller m) (3) Extinction of transmission wire voltage and signal is 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 mm 2 or more (4) Extinction of transmission wire voltage and signal is caused by over-numbered units. (5) Accidental malfunction of abnormality-detected controller (noise, thunder surge) (6) Defective of abnormalitygenerated controller (1) Contact failure of transmission wire of outdoor unit or indoor unit (2) Disconnection of transmission connector (CN2M) of outdoor unit (3) Defective transmitting receiving circuit of outdoor unit or indoor unit (1) During group operation with indoor unit of multi-refrigerant system, if remote controller transmits signal to indoor unit while outdoor unit power supply of one refrigerant system is turned off or within 2 minutes of restart, abnormality is detected. (2) Contact failure of transmission wire of remote controller or indoor unit (3) Disconnection of transmission connector (CN2M) of indoor unit (4) Defective transmitting receiving circuit of indoor unit or remote controller (1) During group o

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.