MXZ-5C42NA3 Service Manual

117
No. Symptom
Indication
Abnormal point /
Condition
Condition Remedy
LED1(Red) LED2(Yellow)
35 Outdoor
unit oper-
ates
normally.
7 times Lit
High → Low
pressure bypass valve
High pressure protec-
tion control at startup of
heating operation
The room temperature is 75.2°F or more when 1 or
2 unit(s) start(s) the heating operation.
(MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA,
MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2,
MXZ-2C20/3C24/3C30NAHZ3, MXZ-5C42NA3,
MXZ-2C20/3C24/3C30NAHZ4, MXZ-5C42NA4)
This symptom does not mean any abnormality of
the product.
High → Low
pressure bypass valve
Compressor oil temper-
ing control at startup of
heating operation
Both the following are true:
•
The outside temperature is 28.4°F or less when
the heating operation is started.
• [(Discharge temperature) - (Indoor heat exchanger
temperature)] < 9°F
(MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA,
MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2,
MXZ-2C20/3C24/3C30NAHZ3, MXZ-5C42NA3,
MXZ-2C20/3C24/3C30NAHZ4, MXZ-5C42NA4)
36
8 times Lit
Cooling evaporating
temperature
protection
During cooling operation, the temperature of indoor
heat exchanger becomes 44.6°F - 51.8°F* or less
within 1 hour after the compressor starts running, or
it becomes 48.2°F - 62.6°F* or less later than that.
* It depends on the indoor unit type/model or the
di󰀨erence between the set temperature and the
room temperature.
This symptom does not mean any abnormality of
the product.
37
9 times Lit Inverter check mode
The unit is operated with emergency operation
switch.
—
38 Lit Lit Normal — —
NOTE
: 1. The location of LED is illustrated at the right figure. Refer to 12-7.1.
2. LED is lit during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is “2”.
ON
OFF
2.5-second OFF
2.5-second OFF
0.5-second ON 0.5-second ON
LED1
LED2
Lit
Outdoor control P.C. board
(Parts side)
OBH702M