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Toshiba
H04
Operation of case thermostat
When the case thermostat exceeds
125°C.
O
×
1.Check the refrigeration cycle (gas
leak).
2.Check the case thermostat and
connector.
3.Check that the service valve is fully
open.
4.Defect of the pulse motor valve.
5.Check for a kinked piping.
492
L10
Unset service PC board jumper
Jumpers J800-J803 have not been cut.
O
× 1.Cut J800-J803. 1 92
L29
The communication between the
outdoor PC board MUCs error
No communication signal between IPDU
and CDB.
O
× 1.Replace the outdoor control board. 1 93
P03
The outlet temperature error
When the discharge temperature sensor
(TD) exceeds 111°C.
O
×
1.Check the refrigeration cycle (gas
leak).
2.Defect of the pulse motor valve.
3.Check the resistance value of the
discharge temperature sensor (TD).
494
P04 The high pressure switch error O
× 10 94
P05
The power supply voltage error
When the power supply voltage is
extremely high or low.
O
×
1.Check the power supply voltage.
(AC230 V±23 V)
494
P07
Overheating of heat-sink error
When the heat-sink exceeds 105°C.
O
×
1.Check the thread fastening and
heat-sink grease between the
outdoor control board and the heat-
sink.
2.Check the heat-sink fan duct.
3.Check the resistance value of the
heat-sink temperature sensor (TH).
495
P15
Detection of gas leak
When the discharge temperature sensor
(TD) exceeds 106°C for consecutive 10
min.
When the suction temperature sensor
(TS) exceeds 60°C for cooling or 40°C
for heating for 10 consecutive min.
O
×
1.Check the refrigeration cycle (gas
leak).
2.Check that the service valve is fully
open.
3.Defect of the pulse motor valve.
4.Check for a kinked piping.
5.Check the resistance value of the
discharge temperature sensor (TD)
and the suction temperature sensor
(TS).
495
P19
The 4-way valve inversion error
When the heat exchange temperature
sensor (TE) exceeds 30°C or the suction
temperature sensor (TS) exceeds 50°C
during the heat pump operation.
O
×
1.Check the operation of the 4-way
valve unit or the coil characteristics.
2.Defect of the pulse motor valve.
3.Check the resistance value of the
heat exchange temperature sensor
(TE) and the suction temperature
sensor (TS).
496
Check
code
Diagnostic functional operation
Determination and action
Number of
abnormalities
for
confirmation
Detailed
item
Operational cause
Backup
present
Automat
ic reset
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 71 Monday, October 5, 2009 2:09 PM