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Fan Mode:
1. On a call for fan operation, the thermo-
stat sends a continuous on signal to the
blower.
2. The circulating air blower ramps to the
programmed airfl ow rate for the FAN ON
mode.
Furnace Fails to Operate
If the furnace does not operate check the fol-
lowing:
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 fi lter dirty or plugged?
8. Is the fl ame sensor coated? (Remove and
clean with emery cloth.)
If the furnace locks out after 5 attempts for igni-
tion, it will try again every hour if a call for heat
remains.