Dettson COND-09-01, Installation Instructions And Homeowner'S Manual

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7.3- MALFUNCTION & STATUS CODES OF THE INTERFACE CARD FLASHING LEDS
Locate the various colored leds on the interface card on the figure below:
Figure 29: Interface card
Table 4: Malfunction and status display of interface card
LED
COLOR Blinking ON OFF Cause (If abnormal) Solution
Green The interface board
is powered up and is
trying to communicate
with the outdoor unit
(Normal) The interface has
stopped operation The interface has
stopped operation
-
The supply voltage is too low
- An high voltage or EMI event
occurred
-
Make sure
24VAC are
reaching the R-C
connections
- Verify the
connections
- Cycle the power
Orange The interface is
communicating with
the outdoor unit
(Normal) The interface does
not receive
communication
signals from the
outdoor unit The interface does
not receive
communication
signals from the
outdoor unit
-
The units are not connected
properly
-
Make sure the
connections are
made as per
Figure 13, Figure
14 and Figure 15
-
Cycle the power
of both units
Yellow When communicating
properly with the
communicating
furnace, this LED
should be blinking by
short bursts
(Normal with
communicating
installations) If the LED is ON
most of the time
and it turns OFF for
very short periods,
the “1” and “2” wires
are most likely
reversed The interface does
not communicate
with the modulating
furnace
(Normal when
legacy wiring is
used) - If the installation is
communicating and the LED
is ON most of the time and
the it turns OFF for very short
periods, the “1” and “2” wires
are most likely reversed
- Turn off the
power of both the
furnace and the
outdoor unit and
invert the “1” and
“2” wires
- Turn both units
“ON”
Blue NA Legacy thermostat
is calling for cooling Legacy thermostat
is not calling for
cooling
- If the LED has an abnormal
behavior
- Check the
thermostat wiring
Red NA Legacy thermostat
is calling for heating Legacy thermostat
is not calling for
heating
-
If the LED has an abnormal
behavior
-
Check the
thermostat wiring