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8
TROUBLESHOOTING
8-1. Overview
(1) Before engaging in troubleshooting
(a) Applicable models
All Super Module Multi
System
(SMMS-
e
) models.
(Indoor units: MM
∗
-AP
∗∗∗
, Outdoor units: MMY-MAP
∗∗∗
6
∗
)
(b) Tools and measuring devices required
• Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc.
• Multimeter, thermometer, pressure gauge, etc.
(c) Things to check prior to troubleshooting (behaviors listed below are normal)
(2) Troubleshooting procedure
When a
problem
occurs, proceed with troubleshooting in accordance with the procedure shown below.
NOTE
Rather than a
product trouble
(see the List of Check Codes below), the problem could have been caused by
a microprocessor malfunction attributable to a poor quality of the power source or an external noise. Check
for possible noise sources, and shield the remote controller wiring and signal wires as necessary.
e
s
u
a
c
e
l
b
i
s
s
o
P
r
o
i
v
a
h
e
B
.
O
N
1
A compressor would not start
• Could it just be the 3-minute delay period (3 minutes after compressor
shutdown)?
• Could it just be the air conditioner having gone
thermostats
OFF?
• Could it just be the air conditioner operating in fan mode or put on the timer?
• Could it just be the system going through initial communication?
2
An indoor fan would not start
• Could it just be cold air discharge prevention control, which is part of
heating?
3
An outdoor fan would not start or would
change speed for no reason
• Could it just be cooling operation under low outside temperature
conditions?
• Could it just be defrosting operation?
4
An indoor fan would not stop
• Could it just be the elimination of residual heat being performed as part of
the air conditioner shutdown process after heating operation?
5
The air conditioner would not respond to a
start/stop command from a remote controller
• Could it just be the air conditioner operation under external or remote
control?
Problem
Any other
problem
Investigate check code
displayed on interface P.C. board
of header unit
Investigate check code
displayed on interface P.C.
board of relevant follower unit
Check
the problem
site or
problem
part
"E28"
check code
CAUTION
The cooling performance may decling considerably when total operating capacity of cooling indoor units is
less than 4 HP WHILE AMBIENT TEMPERATURE IS BELOW 0°C.
−
1
60
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Summary of Contents for MMY-MAP0806HT7(J)P
Page 306: ...For HT8 J P E HT8 J P TR model 305 ...
Page 307: ...For T8 J P T7 J P T8P SG T8 J P ID T8 J P T model 306 ...
Page 313: ... 312 For HT8 J P E HT8 J P TR model ...
Page 314: ... 313 For T8 J P T7 J P T8P SG T8 J P ID T8 J P T model ...
Page 320: ... 319 For HT8 J P E HT8 J P TR model ...
Page 321: ... 320 For T8 J P T7 J P T8P SG T8 J P ID T8 J P T model ...
Page 350: ......