Toshiba MMW-AP0481CHQ-E Service Manual page 43

List of check codes (Hot Water Module)
(Trouble detected by Hot Water Module)
Check code
Outdoor 7-segment display
Main
remote
Check
controller
code
A01 A01 Detected indoor nuit No.
A02 A02 Detected indoor unit No.
A04 A04 Detected indoor nuit No.
A05 —
A06 —
A07 —
A08 —
A09 A09 Detected indoor unit No.
A10 —
A11 —
A12 —
A13 —
A14 —
A15 —
A16 —
A17 —
A18 —
A19 —
A22 —
A23 —
A24 —
A25 —
A26 —
A27 —
A28 —
Typical trouble site
Sub-code
Flow switch operation trouble
Water temperature decrease
trouble
Activation of water heat
exchanger frost protection
Activation of water High-
—
temperature protection
Activation of low-pressure
—
protection
PMV 2 trouble
—
Reversal of inlet water
—
temperature and outlet water
temperature
Mixed refrigerant
— TD/TE/TS sensor trouble
TD/TE/TS sensor connection
—
trouble
Pressure sensor trouble (PD, PS) Output voltage of PD/PS sensor is zero. PD sensor is reverse to
—
— EEPROM (I/F) trouble
— Heat sink overheat trouble
IGBT short-circuit protection
—
trouble
Current detection circuit system
—
trouble
Compressor trouble (lock)
—
— Compressor breakdown
Compressor position detection
—
circuit system trouble
Compressor case thermostat
—
operation
— High-pressure SW system trouble High-pressure SW operated.
— TH sensor trouble
— Discharge temperature TD trouble Discharge temperature (TD) is higher than the specified value.
Gas leak detection (R134a)
—
— High-pressure protective operation
H-HWM communication trouble
—
between I/F and IPDU.
When water flow rate is reduced.
Water temperature continued the low status regardless of that the
water-heater and water pump is operating.
Frost protection for water heat exchanger is activated.
Compressor is in operation, water temperature (TWI or TWO)
maintain the state of high.
Compressor is in operation, Low-pressure PS sensor or High-
pressure PD sensor detects lower pressure than the specified
value.
Compressor is in operation, PMV 2 is in smaller angle than the
specified value and the refrigerant superheat of compressor
inlet maintain the state of small.
Compressor is in operation, inlet water temperature (TWI) is
higher than outlet water temperature (TWO).
Compressor is in operation, the difference between TU and TE is
higher than the specified value.
Resistance value of sensor is infinite or zero (Open/Short).
The difference between TE and TS is higher than the specified value.
The difference between TS and TD is higher than the specified value.
PS sensor.
P.C. board (I/F) do not operate normally.
IGBT built-in temp sensor (TH) is overheated.
Instant over-current was detected when compressor started
operation.
While inverter compressor stopped, the status that current flowed
more than the specified amount was detected.
Over-current was detected a few seconds after inverter
compressor had started.
Inverter current detection circuit detected over-current and stopped.
Position detection is not going on normally.
Compressor case thermostat performed protective operation due
to overheating of compressor.
Resistance value of sensor is infinite or zero (Open/Short).
Discharge temperature (TD) and refrigerant superheat (SH) are
higher than the specified value.
PD sensor detect pressure is higher than the specified value.
Communication interrupted between HHWM P.C. board (I/F) and
H-HWM P.C. board (IPDU).
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Description of trouble