Toshiba MMY-MAP0726FT2P-UL - Page 159

Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
P13 P13 –
I/F Outdoor liquid
backflow
detection trouble
All stop
<During cooling operation>
When system is in cooling
operation, high pressure is
detected in follower unit that
has been turned off.
<During heating operation>
When system is in heating
operation, outdoor PMV 1
continuously registers
opening of 300p or less
while under superheat
control.
• Check full-close operation
of outdoor PMV (1, 3, 4).
• Check for trouble in PD or
PS sensor.
• Check gas balancing
circuit (SV2) for clogging.
• Check balance pipe.
•
• Check trouble in outdoor
P.C. board (I/F).
• Check capillary of oil
separator oil return circuit
for clogging.
• Check for leakage of
check valve in discharge
pipe convergent section.
P15 P15
01: TS condition I/F Gas
leakdetection
(TS1 condition)
All stop
Protective shutdown due to
sustained suction
temperature at or above
judgment criterion
for at least 10 minutes is
repeated four times or more.
<TS trouble judgment
criterion>
In cooling operation: 140°F
(60°C)
In heating operation: 104°F
(40°C)
• Check for insufficiency in
refrigerant quantity.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check PMVs (PMV1,3, 4)
for clogging.
• Check resistance
characteristics of TS1
sensor.
•
•
Check for trouble in 4-way
valve.
Check SV4 circuit for
leakage
02: TD condition I/F Gas leak
detection
(TD condition)
All stop
Protective shutdown due to
sustained discharge
temperature (TD1 or TD2)
at or above 226.4°F (108°C)
for at least 10 minutes is
repeated four times or
more.
• Check for insufficiency in
refrigerant quantity.
• Check PMVs (PMV 1,3,4)
for clogging.
• Check resistance
characteristics of TD1 and
TD2 sensors.
• Check indoor filter for
clogging.
• Check piping for clogging.
• Check SV4 circuit (for
leakage or coil installation
trouble).
P17 P17 –
I/F Discharge
temperature
TD2 trouble
All stop
Discharge temperature (TD2)
exceeds 239°F (115°C).
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1,3,4) for clogging.
• Check resistance
characteristics of TD2
sensor.
• Check for trouble in 4-
way valve.
• Check SV4 circuit for
leakage.
• Check SV4 circuit (for
wiring or installation
trouble involving SV41
and SV42).
• Check for SV15 for
clogging.
• Check stuck in the check
valve of the circuit which
by passes the main heat
exchanger and sub heat
exchanger.
− 158 −
Check SV3B circuit for
clogging.