Toshiba HWS-802XWHM3-E Service Manual page 69

Diagnostic functional operation
Check
code
Operational cause
Pressure switch operation
The pressure switch operates for 300
A07 sec continuously during the heat pump
operation.
Low pressure sensor operation error
The low pressure sensor detected 0.2
MPa or less.
A08
Overheat protection operation
When the thermostat of the backup
heater activates during the operation of
A09
the heat pump or backup heater.
When the thermostat operation is
activated while it has been stopped.
Operation of the release protection
When the TWO release counts to 10.
A11
Heating, hot water heater
The antifreeze control is detected under
the condition of TWI<20°C while
A12
TWI > 15°C, TTW>20°C is not detected
after the heater backup.
Regular communication error
between hydro unit and remote
controller
E03
When there is no regular communication
from the remote control for 3 min, or
when no remote control is equipped.
Regular communication error
between hydro unit and outdoor unit
E04
The serial signal cannot be received
from outdoor.
TC sensor error
F03 Open or short circuit in the heat
exchange temperature sensor.
TWI sensor error
F10 Open or short circuit in the water inlet
temperature sensor.
TWO sensor error
F11 Open or short circuit in the water outlet
temperature sensor.
TTW sensor error
F14 Open or short circuit in the hot water
cylinder sensor.
Determination and action
Backup Automat
present ic reset
1. Almost no or little water flow.
2. Defect of the flow switch.
×
O
3. On-load operation under the above
conditions.
4. Defect in the pressure switch.
1. Almost no or little water flow.
2. Defect of the flow switch.
3. On-load cooling or prolonged
×
O
defrosting (a lot of frost formation)
under the above conditions.
4. Defect in the low pressure sensor.
1. No water (heating without water) or
no water flow.
2. Defect of the flow switch.
×
O
3. Defect of the backup heater (poor
automatic reset thermostat).
Heating
1. Almost no water flow.
Cooling
× × 2. Defect of the flow switch.
3. Check the water outlet temperature
Hot water
sensor (TWO).
O
1. Activated by a large load of heating
or hot water supply.
2. Check the heater power circuit
O O (backup or hot water cylinder
heater).
• Power supply voltage, breaker,
power supply connection
1. Check remote control connection.
×
O
2. Defect in the remote control.
1. Check the serial circuit.
• Miswiring of the crossover between
O O
the water heat exchanger and the
outdoor unit
1. Check the resistance value and
O O connection of the heat exchange
temperature sensor (TC).
1. Check the resistance value and
O O connection of the water inlet
temperature sensor (TWI).
1. Check the resistance value and
×
O connection of the water outlet
temperature sensor (TWO).
1. Check the resistance value and
×
O connection of the hot water cylinder
sensor (TTW).
68
Number of
abnormalities Detailed
for item
confirmation
1 79
8
80
2
2
81
1
10 82
1 83
1 —
1 84
1 85
1 86
1 87
1 87