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LED
LED Status
Off
Red
2 Flashes
Communications
LED
Rapid Flashing • Normal network traffic
On Solid
Green
Receive
LED
S
T
YSTEM
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
R
S
AULT
ECALL
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
C
S
:
AULT
LEAR
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.
Indication
• Normal condition
• None
• Out-of-box reset
• Control power up
• Learn button depressed
• Control is "talking" on
network as expected
• Data 1/ Data 2 miss-
• Data 1 and data 2 wires reversed
wire
at furnace, thermostat or
communicating compatible
outdoor AC/HP
• Short between data 1 and
data 2 wires.
• Short between data 1 or
data 2 wires and R
(24VAC) or C (24VAC
common).
Possible Causes
Corrective Action(s)
• None
• None
• None
• Check communications
wiring (data 1/ data 2
wires).
• Check wire connections at
terminal block
• Check data 1/ data 2
voltages.
N
S
ORMAL
EQUENCE OF
P
U
OWER
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
M
EATING
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.
•
The percentage of heating demand is sent from the
furnace control board to determine what RPM the
draft inducer should run at. A higher percentage
demand will drive the inducer RPM higher. This will
cause the gas valve to modulate higher. The burner
will modulate based on the inducer speed
50
Notes & Cautions
• None
• None
• None
• 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
O
PERATION
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