Mitsubishi Electric EHSD-MED Service Manual page 49

Check code Title and display conditions
E7 Indoor/outdoor communication failure
(Transmission error)
Check code E7 is displayed if signal "1" is
received 30 consecutive times despite the FTC
board sending signal "0".
E1/E2 Main remote controller control board failure
Check code E1 displayed if main remote control-
ler cannot access it is non-volatile (non power
dependent) memory.
Check code E2 is displayed when there is a fault
with the main remote controller's internal clock.
J0 Indoor unit/wireless receiver communication
failure
Check code J0 is displayed when the FTC can-
not receive data from the wireless receiver for 1
minute.
J1 to J8 Wireless remote controller/wireless receiver
communication failure
(Reception error)
Check code displayed if wireless receiver
receives no/incomplete data from the wireless
remote controller for 15 consecutive minutes.
The digit after the J refers to the address of the
wireless remote controller that has the error.
E.g. Check code "J3" refers to a communication
fault between the wireless receiver and wireless
remote control with address 3.
J9 Main remote controller communication failure
Check code J9 is displayed when signal is not
received normally from FTC (sub) for 3 minutes.
EE Combination error between FTC and outdoor unit R410A outdoor unit is combined incorrectly. Check combination of FTC and outdoor unit.
U*, F*, A* Outdoor unit failure
Note: To cancel check codes please switch system off (press button F4 (RESET) on main remote controller).
OCH712C
Possible Cause
1. Fault with FTC transmission/receiving
circuit board
2. Electrical noise causes interference
with power supply.
3. Electrical noise causes interference
with FTC-outdoor unit transmission
cable.
1. Fault with the main remote controller
circuit board
1. Connection fault with wireless receiver-
FTC connection
2. Fault with FTC receiving circuit board
3. Fault with wireless receiver's transmis-
sion circuit board
4. Electrical noise causes interference
with wireless receiver communication
cable.
1. Battery on wireless remote control may
be flat.
2. The wireless remote controller is out of
range of the wireless receiver.
3. Fault with wireless remote controller
transmission circuit board
4. Fault with wireless receiver's reception
circuit board
Refer to check codes. (E0 and E4)
Outdoor unit failure
49
Diagnosis and action
1. to 3.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered indepen-
dently from the outdoor unit).
If the E7 code is still displayed the FTC
circuit board should be replaced.
1. Replace main remote controller circuit
board.
1. Check the connections to the wireless re-
ceiver and FTC have not become loose and
that the connecting cable is not damaged.
2. to 4.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered indepen-
dently from the outdoor unit).
If the J0 code is still displayed, the FTC
and/or the wireless receiver circuit board
should be replaced.
1. Check and replace the battery on wireless
remote control if necessary.
2. to 4.
Reposition the wireless remote control
closer to the receiver and perform a
communication test.
For procedure, refer to wireless remote
controller installation manual.
If "OK" is displayed, then the cause of the
J1 to J8 error was the controller was out of
range of the receiver.
The wireless remote controller should be
installed within range of the receiver.
If "Err" is displayed, replace wireless remote
controller with a new controller and perform
the pairing procedure.
If the "Err" code is still displayed after this
procedure, the fault is with the receiver unit
(attached to the indoor unit).
The receiver unit should be replaced with
a new part and the original remote control
can be reconnected.
If "OK" is displayed, then the fault is with
the remote control and this should be
replaced.
Refer to outdoor unit service manual.