Mitsubishi Electric PUHZ-RP8YHA Technical & Service Manual page 31

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13-3-2. Wired Remote controller Diagnosis
If operation can not be carried out from remote controller, try
remote controller diagnosis with following process.
1 First, check the electricity current marker.
When correct voltage (DC12V) is not supplied to remote
controller, the electricity current marker is put out.
If the electricity current marker is not lighted, check the
remote controller wiring and the indoor units.
a) Electric current marker
2 Transfer to remote controller diagnosis mode
Hold down the H "CHECK" button for five seconds or more,
and following display appears.
Press the A "FILTER" button, and remote controller diagno-
sis will begin.
3 Remote controller diagnosis result
(1) When the remote controller is functioning correctly
Check other possible causes, as there is no problem
with remote controller.
Consider the unit is normal when remote controller trans-
mits the result of diagnosis to indoor or outdoor unit and
receives the same data back.
(2) When remote controller has malfunction
The remote controller must be replaced.
If the transmitting-receiving circuit is defective, ['NG']
blinks.
"NG" will be displayed when remote controller transmits
the result of diagnosis to indoor or outdoor unit, and
receives no response.
When there might be other problems than diagnosed remote
controller,
(3) There might be noise on transmission path or damage of
other remote controllers or indoor units. Check the trans-
mission path and other controllers.
If the transmission is not possible, [E3] blinks.
"E3" will be displayed when remote controller transmits
the result of diagnosis to indoor or outdoor unit and
receives different data back.
(4) The number of data errors means the difference
between the number of bits sent from remote controller
and the actual number of bits sent to transmission path.
If the data error is displayed, noise and etc. are interfer-
ing with the transmission data. Check the transmission
path.
If the data error has occurred, [ERC] and number of data
errors are displayed.
b) Number of generated data errors (maximum 66 errors)
When the number of data errors is 02.
Transmission data from remote controller
Transmission data on transmission path
4 Cancel the remote controller diagnosis
Hold down the H "CHECK" button for five seconds or more
to cancel remote controller diagnosis, then [H0] operation
lamp will blink and the display screen will return to the sta-
tus before remote controller diagnosis in about 30 seconds.