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24 18-CD21D1-5
Installer’s Guide
File Number 18-CD21D1-5
Supersedes 18-CD21D1-4
Date 05/08
INTEGRATED FURNACE CONTROL ERROR FLASH CODES
Flashing Slow --- Normal - No call for Heat
Flashing Fast --- Normal - Call for Heat
Continuous ON --- Replace IFC
Continuous OFF --- Check Power
2 Flashes --- System Lockout (Retries or Recycles exceeded)
3 Flashes ---
Draft Pressure Error - Possible problems:
a) Venting problem
b) Pressure switch problem
c) Inducer problem
4 Flashes --- Open Temperature Limit Circuit
5 Flashes --- Flame sensed when no flame should be present
6 Flashes --- 115 volt AC power reversed, poor grounding or system voltage too low
7 Flashes --- Gas valve circuit error
8 Flashes --- Low flame sense signal
9 Flashes ---
Check Ignitor Circuit and Line "N" to 24VAC "Common" voltage (≤ 2 volts)
[possible grounding problem]
2. LOSS OF FLAME OR GAS SUPPLY FAILURE
If loss of flame occurs during a heating cycle (when
flame is not present at the sensor), the control mod-
ule will retry the ignition sequence up to two times
after the sensor cools. If ignition is not achieved, it
will lockout the furnace.
3. POWER FAILURE
If there is a power failure during a heating cycle,
the system will restart the ignition sequence auto-
matically when power is restored, if the thermostat
still calls for heat.
4. INDUCED DRAFT BLOWER FAILURE
If pressure is not sensed by the pressure switch, it
will not allow the gas valve to open, therefore the
unit will not start. If failure occurs during a running
cycle, the pressure switch will cause the gas valve
to close and shut the unit down.
Carbon monoxide, fire or smoke can cause serious
bodily injury, death, and/ or property damage.
A variety of potential sources of carbon monoxide can be
found in a building or dwelling such as gas-fired clothes
dryers, gas cooking stoves, water heaters, furnaces and
fireplaces. The U.S. Consumer Product Safety Commis-
sion recommends that users of gas-burning appliances
install carbon monoxide detectors as well as fire and
smoke detectors per the manufacturers installation in-
structions to help alert dwelling occupants of the pres-
ence of fire, smoke or unsafe levels of carbon monoxide.
These devises should be listed by Underwriters Labora-
tories, Inc. Standards for Single and Multiple Station
Carbon Monoxide Alarms, UL 2034 or CSA Interna-
tional Standard, Residential Carbon Monoxide Alarming
Devices, CSA 6.19.
NOTE:
The manufacturer of your furnace does not test any de-
tectors and makes no representations regarding any
brand or type of detector.
Failure to follow safety warnings exactly, could
result in a fire or explosion causing property
damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier,
call the fire department.
— Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
▲
WARNING
!
Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right
to change design and specifications without notice.
Trane
6200 Troup Highway
Tyler, TX 75707
For more information contact
your local dealer (distributor)