Toshiba MMW-AP0481CHQ-E Service Manual page 51

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
A14 — —
A15 — —
A16 — —
A17 — —
A18 — —
A19 — —
A21 — —
A22 — —
A23 — —
A24 — —
A25 — —
A26 — —
Location
Description
of
detection
Indoor unit Heat sink
(H-HWM) overheat trouble
Indoor unit IGBT short-circuit
(H-HWM) protection trouble
Indoor unit Current detection
(H-HWM) circuit system
trouble
Indoor unit Compressor
(H-HWM) trouble (lock)
Indoor unit Compressor
(H-HWM) breakdown
Indoor unit Compressor
(H-HWM) position detection
circuit system
trouble
Indoor unit Inverter DC
(H-HWM) voltage (Vdc)
trouble
(compressor)
Indoor unit Compressor case
(H-HWM) thermostat
operation
Indoor unit High-pressure
(H-HWM) SW system
trouble
Indoor unit TH sensor trouble Stop of
(H-HWM)
Indoor unit Discharge
(H-HWM) temperature TD
trouble
Indoor unit Gas leak
(H-HWM) detection (R134a)
Check code detection
System status
condition(s)
Stop of IGBT built-in temp sensor
corresponding (TH) is overheated.
unit
Stop of Instant over-current was
corresponding detected when
unit compressor started
operation.
Stop of While inverter
corresponding compressor stopped, the
unit status that current flowed
more than the specified
amount was detected
Stop of Over-current was
corresponding detected a few seconds
unit after inverter compressor
had started.
Stop of Inverter current detection
corresponding circuit detected over-
unit current and stopped.
Stop of Position detection is not
corresponding going on normally.
unit
Stop of Inverter DC voltage is too
corresponding high (overvoltage) or too
unit low (undervoltage).
Stop of Compressor case
corresponding thermostat performed
unit protective operation due
to overheating of
compressor.
Stop of High-pressure SW
corresponding operated.
unit
Resistance value of
corresponding sensor is infinite or zero
unit (Open/Short circuit).
Stop of Discharge temperature
corresponding (TD) is higher than the
unit specified value.
Stop of Discharge temperature
corresponding (TD) and refrigerant
unit superheat (SH) are
highger than the
specified value.
– 51 –
Check items (locations)
• Check power voltage
• Check cooling fan trouble.
• Check clogging of heat sink
cooling duct.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check connection of cabling
connector on H-HWM P.C. board
(IPDU).
• Check compressor trouble and
layer short circuit.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check compressor trouble
• Check power voltage.
(AC220V - 10% to 240V + 10%).
• Check cable of compressor system
and phase-missing.
• Check connector/terminal
connection on H-HWM P.C. board
(IPDU).
• Check H-HWM P.C. board (IPDU)
trouble.
• Check power voltage
(AC220V - 10% to 240V + 10%).
• Check compressor trouble.
• Check cause of abnormal overload
operation.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check connection of cabling
connector
• Check compressor trouble and
layer short circuit.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check TD sensor trouble
• Check clogging of PMV 2.
• Check clogging of cascade heat
exchanger.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check refrigerant shortage (R134a)
• Check PD pressure sensor trouble
• Check clogging of PMV2.
• Check clogging of water heat
exchanger.
• Check H-HWM P.C. board (IPDU)
trouble.
• Check refrigerant overcharge
(R134a)
• Check H-HWM P.C. board (IPDU)
trouble.
• Check clogging of PMV2.
• Check characteristics of TD sensor
resistance value.
• Check refrigerant shortage
(R134a).
• Check refrigerant shortage (R134a).
• Check clogging of PMV2.
• Check characteristics of TD sensor
resistance value.