Toshiba MMU-P0121H Service Manual page 56

Check Detected Check
code position code name
dd Interface Outdoor
refrigerant
leakage
detection
dE Indoor Indoor
address
undefined
dF Interface Outdoor
address
undefined
E1 Interface Fixed-
speed high
pressure
SW system
alarm (1)
Cause Trouble detection
(Position) condition
Outdoor • The status that pressure
liquid line value is high was
interrupt detected in the stopped
circuit fixed-speed outdoor unit
when the system
operated in COOL mode.
• The status that PMV
opening degree is the
minimum 100P is
continued for a long time
during S.H control while
the system is operated in
HEAT mode.
During There was undefined
automatic address in the indoor
indoor addresses.
address
During There was undefined
automatic address in the outdoor
outdoor addresses.
address
Fixed- High pressure SW circuit
speed high or IOL, OCR system circuit
pressure operated.
SW system
n When high pressure
circuit
Pd ≥ 2.5MPa,
(Compress
[High pressure SW
or 1)
system error]
1) In case of
compressor 1 :
[E1] is displayed.
2) In case of
compressor 2 :
[F0] is displayed.
n When high pressure
Pd < 2.5MPa,
[IOL, OCR system error]
1) In case of
compressor 1 :
[E6] is displayed.
2) In case of
compressor 2 :
[F1] is displayed.
• Check preceding close operation of outdoor PMV
A (PMV 1 and PMV 2).
• Liquid line check valve
(Cooling only model)
• Check for blockage of gas balance circuit (SV2).
• Check capillary for bypass between fixed-speed
outdoor gas pipe and heat exchange line.
• Check for blockage of oil return circuit (SV3B
peripheral circuits).
1) Blockage of check valve
2) Blockage of capillary
3) Blockage of SV3B
(Check all outdoor units.)
4) Blockage of balancing pipe
(Check pipe between outdoor units.)
• Check for blockage of oil return capillary of oil
separator.
• Check 4-way valve error.
• Check outdoor P.C. board (interface) error.
*
Wait for a while during display.
When the address is defined, the operation is
automatically reset.
*
If the check code does not disappear 20 minutes
after turning on the power, it is abnormal.
Check the following items.
• Check failure of indoor main P.C. board (MCC-
1361).
• Check communication noise source.
• Check Incorrect set up of jumper on indoor main
P.C. board (MCC-1361)
*
Wait for a while during display.
When the address is defined, the operation is
automatically reset.
*
If the check code does not disappear 5 minutes
after turning on the power, it is abnormal.
Check the following items.
• Check indoor P.C. board (interface) error.
• Check communication noise source.
• Check high pressure SW error of compressor 1,
and check IOL, OCR operation.
• Check IOL operation of compressor 1 and case
temp. up.
(Check cause of overload operation.)
• Check operation and blockage of SV41 valve.
• Check if service valve is fully open.
• Check outdoor fan operation and connector
connection.
• Check outdoor fan motor and running capacitor
error.
• Check for blockage of outdoor PMV.
1) Refrigerant choke circuit (PMV A)
2) Cooling bypass circuit (PMV B)
3) Liquid line check valve
(Cooling only model)
• Check for blockage of indoor/outdoor hea
exchanger.
• Check Pd pressure sensor error.
• Check for blockage of hot gas bypass SV2 circuit.
• Check outdoor P.C. board (interface) error.
• Check indoor fan error.
(Cause of air volume down)
• Check indoor PMV open valve status.
• Check miswiring between indoor/outdoor
communication line.
3-53
Check item (Position)