Mitsubishi Electric PAA-A18AA1 Manual De Mantenimiento página 48

Error Abnormal point and detection method
Code
NOTE
3) It takes at least 27 minutes to
detect abnormality.
4) It excludes the period of defrosting
(Detection restarts when defrosting
mode is over)
Heating range: 3˚ C (5.4˚ F) [ (TH5-TH1)
P9 Abnormality of pipe temperature thermistor / Condenser-Evapora-
tor (TH5)
(5105)
1. The unit is in three-minute resume protection mode if short/
open of thermistor is detected. Abnormal if the unit does not
get back to normal within three minutes. (The unit returns to
normal operation, if it has normally reset.)
2. Constantly detected during cooling, drying, and heating op-
eration (except defrosting) Short: 90˚ C [194˚ F] or more
Open: -40˚ C [-40˚ F] or less.
E0 Remote controller transmission error (E0) / signal receiving
error (E4)
(6831)
or
1. Abnormal if main or sub remote controller can not receive
E4
normally any transmission from indoor unit of refrigerant
(6834)
address "0" for three minutes. (Error code: E0)
2. Abnormal if sub remote controller could not receive for any
signal for two minutes. (Error code: E0)
3. Abnormal if indoor controller board can not receive normally
any data from remote controller board or from other indoor
controller board for three minutes. (Error code: E4)
4. Indoor controller board cannot receive any signal from re-
mote controller for two minutes. (Error code: E4)
E3 Remote controller transmission error (E3) / signal receiving
error (E5)
(6201)
or
1. Abnormal if remote controller could not find blank of trans-
E5
mission path for six seconds and could not transmit. (Error
(6203)
code: E3)
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 and all-
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
1.
2.
48
Cause
Defective thermistor char- 1–3. Check resistance value of thermistor. For
acteristics characteristics, refer to (P1) above.
Contact failure of connector 2. Check contact failure of connector (CN44) on
(CN44) on the indoor con- the indoor controller board. Refer to Test Point
troller board (Insert failure) Diagram. Turn the power on and check restart
after inserting connector again.
Breaking of wire or contact
failure of thermistor wiring 4. Operate in test run mode and check pipe
< condenser / evaporator > temperature. If pipe
Temperature of thermistor
< condenser / evaporator > temperature is ex-
is 90˚ C [194˚ F] or more
tremely low (in cooling mode) or high (in heating
or -40˚ C [-40˚ F] or less
mode), refrigerant circuit may have defect.
caused by defective refrig-
erant circuit 5. When no problems are found in 1–4 above,
replace the indoor unit control board.
Defective indoor controller
board
Contact failure at transmis- 1. Check disconnection or looseness of indoor
sion wire of remote control- unit or transmission wire of remote controller.
ler
2. Set one of the remote controllers "main". If
All remote controllers are there is no problem with the action above.
set as "sub" remote control-
3. Check wiring of remote controller. • Total
ler. In this case, E0 is dis-
wiring length: max. 500 m (Do not use cable 53
played on remote control-
or more)
ler, and E4 is displayed
• The number of connecting indoor units: max.
at LED (LED 1, LED 2)
16 units
on the outdoor controller
• The number of connecting remote controllers:
circuit board.
max. 2 units
Miswiring of remote con-
When it is not the above-mentioned problem
troller
of 1~3
Defective transmitting re-
4. Diagnose remote controllers.
ceiving circuit of remote
a) When "RC OK" is displayed, Remote control-
controller
lers have no problem. Turn the power off, and on
Defective transmitting re-
again to check. If abnormality generates again,
ceiving circuit of indoor
replace indoor controller board.
controller board of refriger-
b) When "RC NG" is displayed, Replace remote
ant address "0"
controller.
Noise has entered into the
c) When "RC E3" is displayed,
transmission wire of remote
d) When "ERC 00-06" is displayed,
controller
[ c), d)→Noise may be causing abnormality. ]
∗ If the unit is not normal after replacing indoor
controller board in group control, indoor control-
ler board of address "0" may be abnormal.
Two remote controller are 1. Set a remote controller to main, and the other
set as "main." (In case of 2 to sub
remote controllers)
2. Remote controller is connected with only one
Remote controller is con- indoor unit
nected with two indoor
3. The address changes to a separate setting
units or more
4~6. Diagnose remote controller
Countermeasure
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