Toshiba MMY-MAP0804T8P-SG User Manual

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8-8. Leakage/Clogging of Refrigerating Cycle Circuit

List of Check Codes Generated upon Occurrence of Leakage/Clogging in Outdoor Cycle

or Oil Circuit Part

(MMY-MAP0804#, 1004#, 1204#)

Clogging

Leakage

Note: “XX” represents sub-code

Part

Site of fault

(see next page)

Unit generating

check code

Detected fault and check code Symptom

Outdoor PMV1, 2

Corresponding unit Activation of high-pressure protection

Activation of low-pressure protection

Discharge temp. error (TD1)

Discharge temp. error (TD2)

P20

H06

P03

P17

Rise of pressure

Fall of pressure

Rise of discharge temp.

(compressor 1)

Rise of discharge temp.

(compressor 2)

Check valve in discharge pipe

convergent section

Corresponding unit High-pressure protection error

High-pressure SW system error

P20

P04-XX

Abnormal rise of pressure

Check valve in discharge pipe C Corresponding unit High-pressure SW system error P04-XX Abnormal rise of pressure

Check valve in oil-equalization circuit

Capillary

Strainer

Corresponding unit Oil level detection circuit error

Oil level low detection and protection

H16-XX

H07

Oil circuit error or oil level low

SV3A valve E Other connected unit Oil level low detection and protection H07 Oil level low

SV3B valve F Corresponding unit Oil level low detection and protection H07 Oil level low

SV3C valve G Other connected unit Oil level low detection and protection H07 Oil level low

SV3D valve

SV3D valve circuit capillary

Strainer

Corresponding unit Oil level low detection and protection H07 Oil level low

SV3E valve

Corresponding unit Oil level detection circuit error

Oil level low detection and protection

H16-05

H07

Oil circuit error

Oil level low

Oil return distributor J Corresponding unit Oil level low detection and protection H07 Oil level low

SV3C bypass capillary K Corresponding unit Oil level detection circuit error H16-04 Oil circuit error

Part

Site of fault

(see next page)

Unit generating

check code

Detected fault and check code Symptom

Outdoor PMV1, 2

Corresponding unit Outdoor liquid backflow error

Oil level low detection and protection

P13

H07

Refrigerant entrapment

Other connected unit Discharge temp. error (TD1)

Discharge temp. error (TD2)

P03

P17

Rise of discharge temp.

(compressor 1)

Rise of discharge temp.

(compressor 2)

Check valve in discharge pipe

convergent section B

Corresponding unit Oil level low detection and protection

Compressor breakdown

Compressor error (lockup)

H07

H01-XX

H02-XX

Refrigerant entrapment

Check valve in discharge pipe

Corresponding unit Oil level low detection and protection

Compressor breakdown

Compressor error (lockup)

H07

H01-XX

H02-XX

Refrigerant entrapment

Check valve in oil-equalization circuit

Corresponding unit Oil level low detection and protection H07 Excessive amount of oil

(Leaking side)

Insufficient amount of oil

(Normal side)

SV3A valve E Corresponding unit Oil level low detection and protection H07 Oil level low

SV3C valve G Corresponding unit Oil level low detection and protection H07 Oil level low

Questions and Answers:

S
Shane LopezAug 6, 2025
What to do if the Toshiba Air Conditioner indoor remote controller is not accepted and a check code is displayed?
- L
  Lori JohnsonAug 6, 2025
  If the indoor remote controller isn't working and a check code appears on the interface PC board of the header unit, the issue might stem from unset addresses or incorrect power settings. Start by setting up the addresses for the line and indoor units. If you're using group control, make sure a group address is set up. Also, confirm that the indoor unit power is turned on, ensuring you power on the indoor units before the outdoor units. Finally, check that the indoor/outdoor communication line is correctly connected to the U1/U2 terminal of the header unit.
J
janethowardAug 16, 2025
What to do if my Toshiba Air Conditioner is not accepting operation from the indoor remote controller?
- N
  nmeltonAug 16, 2025
  If your Toshiba Air Conditioner indoor unit isn't responding to the remote controller and there's no check code on the header unit's interface PC board, the problem likely lies in the communication wiring or address settings. First, check the communication line between the indoor and outdoor units and modify the wiring if necessary. Next, ensure that both the line address and indoor address are correctly set for the unit that's not responding. If you are using indoor group control, make sure that the power of the header unit of the group is turned on. If the unit is under individual control, verify that the group address is set to “0”. Finally, confirm that the power is turned on for the unit and that the indoor remote controller is properly wired.