Toshiba MMU-UP0071MH-UL Service Manual page 97

Light block Check code
Operation Timer Ready
Blinking
Operation Timer Ready
Synchronized blinking
Operation Timer Ready
Synchronized blinking
H01 Compressor breakdown
H02 Compressor lockup
Current detection circuit trouble
H03
H05 Wiring / installation trouble or detachment of outdoor discharge temperature sensor (TD1)
H06 Abnormal drop in low-pressure sensor (Ps) reading
H07 Abnormal drop in oil level
H08 Trouble in temperature sensor for oil level detection circuit (TK1, TK2)
H15 Wiring / installation trouble or detachment of outdoor discharge temperature sensor (TD2)
H16 Oil level detection circuit trouble - Trouble in outdoor unit TK1, TK2 circuit
H17 Compressor trouble (Step-out)
H28 Compressor motor winding trouble.
L02
Outdoor unit model mismatched trouble
L03 Duplicated indoor group header unit
L05 Duplicated priority indoor unit (as displayed on priority indoor unit)
L06 Duplicated priority indoor unit (as displayed on indoor unit other than priority indoor unit)
L07 Connection of group control cable to stand-alone indoor unit
L08 Indoor group address not set
L09 Indoor capacity not set
L04 Duplicated outdoor refrigerant line address
L10 Outdoor capacity not set
L11 Flow Selector unit or Shut-off Valve unit installation trouble
L12 Flow selector unit(s) system trouble.
L13 Safety measures setting unmatched.
L17
Outdoor model incompatibility
L18 Cooling/heating Flow selector unit trouble.
L20 Duplicated central control address
L23 SW setting trouble
L24 Flow selector unit(s) setting trouble.
L28 Too many outdoor units connected
L29 Trouble in number of P .C. boards
L30
Indoor external interlock trouble
Cause of trouble
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Outdoor unit compressor
related trouble
Protective shutdown of outdoor
unit