Mitsubishi EHST20C-VM2C - Page 67

67
Error code Title and display conditions Possible Cause Diagnosis and action
E0/E4 Main remote controller communication failure
(Reception error)
Error code E0 is displayed if main remote control-
lerdoesnotreceiveanysignalfromtheindoor
unitforref.address"0"for3minutes.
Error code E4 is displayed if indoor unit does not
receive any data from the main remote control-
ler for 3 minutes or indoor unit does not receive
anysignalfromthemainremotecontrollerfor2
minutes.
1. Contactfailurewithtransmissioncable 1. Checkconnectioncablefordamageor
loose connections at the FTC and main
remote controller terminals.
2. Wiringprocedurenotobserved.
(Cablelength/cablediameter/number
of indoor units/number of main remote
controllers)
2. Check main remote controller and FTC
commonwiringmaxcablelength500m.
Only use 2-core cable.
Only connect 1 main remote controller to 1
FTC indoor unit board.
3. Fault on the indoor unit FTC board
sectioncontrollingRef.address"0"
3. to 5.
If the problem is not solved by the above
measures then:
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 E4 code is still displayed the FTC and/
or the main remote controller circuit board
should be replaced.
4. Faultwiththemainremotecontroller
circuit board
5. Electrical noise causes interference
withtransmission/receptionofdatafor
main remote controller.
E3/E5 Main remote controller communication failure
(Transmission error)
Error code E3 is displayed if the main remote
controllercannotndanemptytransmission
path and thus fails to transmit for 6 seconds or
the data received by the main remote controller
isdifferenttowhatwassent(bythemainremote
controller) 30 consecutive times.
ErrorcodeE5isdisplayediftheFTCcannotnd
an empty transmission path for 3 minutes and
thus cannot transmit or the data sent by the FTC
isdifferenttowhatwasexpected30consecutive
times.
1. 2 or more main remote controllers have
been connected to the FTC.
1. Only connect 1 main remote controller to 1
FTC indoor unit board.
2. Faultwithmainremotecontroller
transmission/receivingcircuitboard
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 E3/E5 code is still displayed the FTC
and/or the main remote controller circuit
board should be replaced.
3. Faultwiththemainremotecontroller
circuit board
4. Electrical noise causes interference
withtransmission/receptionofdatafor
main remote controller.
E6 Indoor/outdoor communication failure
(Reception error)
ErrorcodeE6isdisplayedifafterthepoweris
switchedONtotheindoorunit,theFTCboard
doesnotreceiveanysignalorthesignalreceived
is not complete for 6 minutes, or after a period of
operation the FTC board does not receive any
signalorthesignalreceivedisnotcompletefor3
minutes.
* Check the LED display on the outdoor unit
circuit board.
(Connect the A-control service tool, PAC-
SK52ST to test.) Refer to the outdoor unit
servicemanualforexplanationofEA-EC
codes.
1. Contactfailure/shortcircuit/miswiring 1. Check the connections on the indoor and
outdoor units have not become loose and
thattheconnectingcableisnotdamaged.
2. Faultwithoutdoorunittransmission/
receivingcircuitboard
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 E6 code is still displayed the FTC and/
or the outdoor unit circuit board should be
replaced.
3. FaultwithFTCtransmission/receiving
circuit board
4. Electrical noise causes interference
withFTC-Outdoorunittransmission
cable.
E7 Indoor/outdoor communication failure
(Transmission error)
Error code E7 is displayed if despite the FTC
boardsending signal "0",signal"1"isreceived
30 consecutive times.
1. FaultwithFTCtransmission/receiving
circuit board
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.
2. Electrical noise causes interference
withpowersupply.
3. Electrical noise causes interference
withFTC-outdoorunittransmissionca-
ble.
E1/E2
Main remote controller control board failure
Error code E1 displayed if main remote control-
lercannotaccessitisnonvolatile(nonpower
dependent) memory.
ErrorcodeE2isdisplayedwhenthereisafault
withthemainremotecontroller'sinternalclock.
1. Faultwiththemainremotecontroller
circuit board
1. Replace main remote controller circuit
board.
OCH570C