50
LED
LED Status
Indication
Possible Causes
Corrective Action(s)
Notes & Cautions
Off
•
Normal condition
•
None
•
None
•
None
•
Control power up
•
Learn button depressed
Rapid Flashing •
Normal network traffic •
Control is “talking” on
network as expected
•
None
•
None
•
Data 1 and data 2 wires reversed
at furnace, thermostat or
communicating compatible
outdoor AC/HP
•
Check communications
wiring (data 1/ data 2
wires).
•
Turn power OFF prior to
repair.
•
Short between data 1 and
data 2 wires.
•
Check wire connections at
terminal block
•
Verify wires at terminal
blocks are securely twisted
together prior to inserting
into terminal block.
•
Short between data 1 or
data 2 wires and R
(24VAC) or C (24VAC
common).
•
Check data 1/ data 2
voltages.
•
Verify data 1 and data
voltages as described above
Red
Communications
LED
2 Flashes
•
Out-of-box reset
•
None
•
None
Green
Receive
LED
On Solid
•
Data 1/ Data 2 miss-
wire
S
YSTEM
T
ROUBLESHOOTING
NOTE:
Refer to the instructions accompanying the ComfortNet
compatible outdoor AC/HP unit for troubleshooting information.
Refer to the
Troubleshooting Codes
for a listing of possible
furnace error codes, possible causes and corrective actions.
F
AULT
R
ECALL
S
EQUENCE
•
Only allowed in standby mode while display is
showing ON.
•
Hold fault recall push-button for 2-5 seconds (until
display is blank) and then release.
•
Display will then be blank for 2 seconds before
displaying faults stored in history.
•
All faults are displayed one time, from most recent
to least recent.
•
A Maximum of 3 consecutive faults of the same
type will be logged.
•
Each error is displayed for 2 seconds, with a blank
screen for 1 second in between.
•
When all errors have been displayed, the display
returns to ON.
F
AULT
C
LEAR
S
EQUENCE
:
•
Only allowed in standby mode, while display is
showing ON.
•
Hold fault recall push-button for 5-10 seconds
(until display starts flashing “—”) and then release.
•
All faults in the history will have been cleared,
and display returns to ON.
•
If you hold the button for longer than 10 seconds,
the display will return to ON and the faults will
not be cleared.
N
ORMAL
S
EQUENCE
OF
O
PERATION
P
OWER
U
P
The normal power up sequence is as follows:
•
115 VAC power applied to furnace.
•
Integrated control module performs internal checks.
•
Integrated control module monitors safety circuits
continuously.
•
Furnace awaits call from thermostat. Dual 7-segment
LED’s display
O
while awaiting call from thermostat.
H
EATING
M
ODE
The normal operational sequence in heating mode is as fol-
lows:
•
Thermostat contacts close, initiating a call for heat.
•
Integrated control module performs safety circuit
checks.
•
Induced draft blower is energized on high speed for a
15-second prepurge.
•
Induced draft blower steps to low speed following
prepurge. Low stage pressure switch contacts are
closed.
•
Igniter warm up begins upon step to low speed and
presence of closed low stage pressure switch contacts.
•
Gas valve opens at end of igniter warm up period,
delivering gas to burners and establishing flame.
•
Integrated control module monitors flame presence.
Gas valve will remain open only if flame is detected.
