Daikin EEV Series, Installation Instructions Manual

Page: 18 / 28

18
COMMUNICATIONS TROUBLESHOOTING CHART
LED
LED
Status
Indication Possible Causes Corrective Action(s) Notes & Cautions
Off

None

None

None

None
1 Flash

Communications
Failure

Communications
Failure

Depress Learn Button

Verify wiring connection

Depress once quickly for
a power-up reset

Depress and hold for 5
seconds for an out-of-box
reset
2
Flashes

Out-of-box reset

Control power up

Learn button
depressed

None

None
Off

No power

Communications
error

No power to air
handler

Open fuse

Communications
error

Check fuses and circuit
breakers; replace/reset

Replace blown fuse

Check for shorts in low
voltage wiring in air
handler/system

Reset network by
depressing learn button

Check data 1/data2
voltages

Turn power OFF prior to
repair
1 Steady
Flash

No network
found

Broken/ disconnected
data wire(s)

Air handler is
installed as a non-
communicating/
traditional system

Check communications
wiring (data 1/data 2
wires)

Check wire connections at
terminal block

Verify air handler
installation type (non-
communicating/
traditional or
communicating)

Check data 1/data 2
voltages

Turn power OFF prior to
repair

Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block

Verify data 1 and data
voltages as described
above
Rapid
Flashing

Normal network
traffic

Control is "talking"
on network as
expected

None

None
On Solid

Data 1/Data 2
miss-wire

Data 1/data 2 wires
reversed at air
handler, thermostat,
or ComfortNet
TM
compatible outdoor
AC/HP

Short between data
1/data 2 wires

Short between data 1
or data 2 wires and R
(24VAC) or C (24VAC
common)

Check communications
wiring (data 1/data 2
wires)

Check wire connections at
terminal block

Check data 1/data 2
voltages

Turn power OFF prior to
repair

Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block

Verify data 1 and data
voltages as described
above
Red
Communications
LED
Green
Receive
LED