Toshiba MMU-UP0071MH-UL Service Manual page 91

Check code
Outdoor 7-segment display
Sub-code
P17 –
0#: 4-way valves
P19
* Put in outdoor unit No. in [#] mark.
P20 –
(Check code detected by Inverter of Compressor featuring in outdoor unit - typical examples)
Check code
Outdoor 7-segment display
Sub-code
1∗: Compressor 1
F13
2∗: Compressor 2
1∗: Compressor 1
H01
2∗: Compressor 2
1∗: Compressor 1
H02
2∗: Compressor 2
1∗: Compressor 1
H03
2∗: Compressor 2
1∗: Compressor 1
H17
2∗: Compressor 2
1∗: Compressor 1
H28
2∗: Compressor 2
1∗: Compressor 1 side
P05
2∗: Compressor 2 side
1∗: Compressor 1 side
P07
2∗: Compressor 2 side
P11 –
1∗: Fan P.C. board 1
P22
2∗: Fan P.C. board 2
1∗: Compressor 1
P25
2∗: Compressor 2
1∗: Compressor 1
P26
2∗: Compressor 2
1∗: Compressor 1
P29
2∗: Compressor 2
Note: The above check codes are examples only, and different check codes may be displayed depending on the outdoor unit configuration
Display of receiving unit
Central Indicator light block
control or
main remote
Operation Timer Ready
controller
display
P17
P19
P20
Display of receiving unit
Central Indicator light block
control or
main remote
Operation Timer Ready
controller Flash
display
F13 ALT
H01
H02
H03
H17
H28
P05 ALT Compressor Vdc trouble
P07 ALT Heat sink overheat trouble
P11 ALT
P22 ALT
P25 ALT
P26 ALT
P29 ALT
– 91 –
Typical problem site
Flash
Outdoor discharge (TD2) Outdoor discharge temperature sensor (TD2)
ALT
temperature trouble detects abnormally high temperature.
Abnormality in refrigerating cycle is detected
4-way valve reversing
ALT
during heating operation.
trouble
Activation of high-pressure High pressure (Pd) sensor detects high pressure
ALT
protection that exceeds standard value.
Typical problem site
Trouble in temperature
Temperature sensor built into indoor IPM (TH)
sensor built into
has been open/short-circuited.
indoor IPM (TH)
Inverter current (Idc) detection circuit detects
Compressor breakdown
overcurrent.
Compressor trouble
Compressor lockup is detected
(lockup)
Current detection circuit Abnormal current is detected while inverter
trouble compressor is turned off.
Compressor trouble
Compressor is in step-out condition.
(Step-out)
Compressor motor
Compressor motor winding is layer shorted.
winding trouble
Inverter DC voltage is too high (overvoltage)
or too low (undervoltage).
Temperature sensor built into IPM (TH) detects
overheating.
Outdoor heat exchanger Remaining frost on outdoor heat exchanger
freeze trouble has been detected repeatedly.
Outdoor fan P.C. board
Outdoor fan P.C. board detects trouble.
trouble
Compressor P.C. board
IPM for compressor is broken. (Short-circuit etc.)
trouble
Compressor start up
Open phase or IPM over current for compressor
trouble
is detected.
Compressor position Compressor motor position detection trouble is
detection circuit trouble detected.
Description of check code
Description of check code