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Fan Mode:
1. On a call for fan operation, the thermostat
applies 24 VAC to the G terminal on the
furnace control board.
2. The circulating air blower is energized im-
mediately on the heating speed.
3. If the furnace is operated in the continuous
ON position at the thermostat and is then
switched to AUTO, the circulating blower
will operate for a specified delay (factory set
at 120 seconds).
Furnace Fails to Operate
If the furnace does not operate check the follow-
ing:
1. Is the thermostat operating properly?
2. Are the blower compartment door(s) in
place?
3. Is the furnace disconnect closed?
4. Has the circuit breaker tripped or the control
board fuse burned open?
5. Is the gas turned on?
6. Are any manual reset switches open?
7. Is the filter dirty or plugged?
8. Is the flame sensor coated? (Remove and
clean with emery cloth.)
If the furnace locks out after 5 attempts for
ignition, it will try again every hour if a call for
heat remains. If the inducer and circulating air
blowers are operating, and items 1 through 8
have been checked, press the red reset button
on the vent safety switch. (See Figure 28.) If the
furnace operates after depressing the reset
button, contact a qualified serviceman to identify
and repair the problem.
If the furnace continues to not operate, depress
the red reset buttons on the flame rollout switches.
(See Figure 28.) If the furnace operates after
depressing the reset buttons, contact a qualified
servicemen to identify and repair the problem.
Twinning of Two Furnaces
The control board on these furnaces is capable
of being twinned to another G6 furnace, pro-
vided the circuit boards are both UTEC type. If
using UTEC control boards, leave the fuses
installed on each board. The thermostat wires
and the 1/4 inch quick-connect terminals marked
"TWIN" on the furnace controls must be con-
nected together for twinning. (See Figure 29.)
Figure 29. Twinning
W G Y R
Thermostat
A/C
Unit
Twin
Terminal
Twin
Terminal
R
C
Y
G
W
R
C
Y
G
W