Mitsubishi Electric PAA-A18AA1 Service Manual page 48

Error Abnormal point and detection method
Code
E7 Indoor/outdoor unit communication error (Transmitting er-
ror)
(6840)
Abnormal if "1" receiving is detected 30 times continuously
though indoor controller board has transmitted "0".
FB Indoor controller board
(4109) Abnormal if data cannot be read normally from the nonvolatile
memory of the indoor controller board.
E1 Remote controller control board
(6832)
1. Abnormal if data cannot be read normally from the nonvola-
or
tile memory of the remote controller control board. (Error
E2
code: E1)
(6833)
2. Abnormal if the clock function of remote controller cannot be
operated normally. (Error code: E2)
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Cause
1. Defective transmitting re-
ceiving circuit of indoor
controller board
2. Noise has entered into
power supply
3. Noise has entered into out-
door control wire
1. Defective indoor controller
board
1. Defective remote controller
48
Countermeasure
1~3. Turn the power off, and on again to check.
If abnormality generates again, replace indoor
controller board.
1. Replace indoor controller board.
1. Replace remote controller.
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