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These are York error codes
York Furnace error codes are seen in three colors, red, green, and amber/yellow. Each color will also flash a specific number of times to signify a specific error. Breaking down each color, and number of flashes, will help you solve the problem you are having with your York Furnace.

Amber/Yellow Colored Error Code

If you see 1 amber/yellow flash, this means that everything is okay and the thermostat is signaling the need for cooling.

If 2 amber/yellow flashes appear, it signals that everything is okay and there is a call for heat.

If you notice 3 amber/yellow flashes, this means that everything is completely fine and your York Furnace is just completing a recent cycle. Of all of the York Furnace error codes, this is one you may see most frequent.

If 4 amber/yellow flashes appear on your York Furnace, it means that the heating of your system may be somewhat restricted. The air flow will not operate as it should when you see this error code.

5 amber/yellow flashes on your York Furnace signifies that the vent and/or combustion air system is restricted.

If you notice that you are seeing a continuously, fast flashing amber/yellow error code, it means that flame sensing rod needs a little cleaning-up.

Red Colored Error Code

Taking it from the top, if you happen to see 1 red colored flash on your York Furnace, it signals that the gas valve isn’t receiving power. You may have a gas leak at the valve.

2 red colored flashes means that the switch that controls pressure is possibly stuck. If this switch gets stuck in the ‘closed’ position, you will receive this error code.

If you see 3 red colored flashes, it’s possible that your pressure switch is probably just stuck in the ‘open’ position.

4 red colored flashes may be signaling that the “high-limit” switch might be open. A plugged air filter, or restricted air flow may be the reason behind this York Furnace error code.

If you notice 5 red colored flashes on your York Furnace, it signifies that your furnace’s roll-out switch, or auxiliary switch, may be open. This switch can be reset by pushing the center of the red button on your furnace ( it should be located on the side ).

6 red colored flashes on your furnace means that the modulating gas valve has failed. This valve will need to be replaced.

7 red colored flashes signals to you that your furnace is in “lock out mode” . If after 3 attempts to re ignite is unsuccessful, “lock out mode” will remain in place for one-hour. After that hour is up, an attempt to re ignite will occur again.

Green Colored Error Code

If there’s 1 green colored flash on your York Furnace, it means your furnace is performing successfully and no need for heating exists.

2 green colored flashes on your furnace means that it is attempting to recall/retrieve previous York Furnace error codes which are stored. The 2 green colored flashes you are seeing also means that no stored error codes are being found.

If there’s 3 green colored flashes, please see the meaning for 2 green colored flashes above. 3 green colored flashes on your furnace has the same meaning as 2 green colored flashes. Everything is going well with your furnace.
More York furnace error codes
Fault condition Red lite
Power on On
Limit circuit open or external load on "W" 1 flash
Pressure switch is open with inducer on 2 flashes
Pressure switch is closed with inducer off 3 flashes
Ignition failure (check ground) 4 flashes
115 VAC & neutral reversed or no ground 5 flashes
False flame or gas valve relay shorted continuous
Power off off
Yellow
lite
Low flame senser signal continuous flash
Flame present on


These are some common Trane furnace error codes.
Flashing slow: Normal no call for heat
Flashing fast: Normal call for heat
Continuous on: Replace control
Continuous off: Check for power
2 flashes: System lockout (no flame) or reversed polarity
3 flashes: Pressure switch problem
4 Flashes: Thermal (limit) protection off
5 Flashes: Flame sensed with gas valve off


Flashing Slow Normal - No call for Heat from thermostat
Flashing Fast Normal - Call for Heat from thermostat
Continuous ON Control Board Bad - needs replaced
Continuous OFF Check Power
2 Flashes System Lockout (Retries or Recycles exceeded)
3 Flashes Vent Pressure Switch Error
4 Flashes Open High Temperature Limit Device
5 Flashes Flame sensed when no flame should be present
6 Flashes 115 Volt AC power reversed or Poor Grounding
7 Flashes Gas valve circuit error
8 Flashes Low flame sense signal


Flashing Slow Normal - No call for Heat from thermostat
Flashing Fast Normal - Call for Heat from thermostat
Continuous ON Control Board Bad - needs replaced
Continuous OFF Check Power
2 Flashes System Lockout (Retries or Recycles exceeded)
3 Flashes Vent Pressure Switch Error
4 Flashes Open High Temperature Limit Device
5 Flashes Flame sensed when no flame should be present
6 Flashes 115 Volt AC power reversed or Poor Grounding
7 Flashes Gas valve circuit error
8 Flashes Low flame sense signal
9 Flashes Check ignitor circuit and line "N" to 24 VAC Common voltage ( < 2 volts)
(possible grounding problem)



These are Luxaire fault codes
The furnace has built-in, self-diagnostic capability. If a system problem occurs, a blinking LED shows a fault code. The LED can flash red, green or amber to indicate various conditions. It is located behind a clear view port in the blower compartment door.

The control continuously monitors its own operation and the operation of the system. If a failure occurs, the LED will indicate the failure code. If the failure is internal to the control, the light will stay on continuously. In this case, the entire control should be replaced, as the control is not field repairable.

Flash sequence codes 1 through 10 are as follows: LED will turn “on” for 1/4 second and “off” for 1/4 second. This pattern will be repeated the number of times equal to the code. For example, six “on” flashes equals a number 6 fault code. All flash code sequences are broken by a 2 sec- ond “off” period.

SLOW GREEN FLASH: Normal operation.
SLOW AMBER FLASH: Normal operation with call for heat.

RAPID RED FLASH: Twinning error, incorrect 24V phasing. Check twinning wiring.

RAPID AMBER FLASH: Flame sense current is below 1.5 microamps. Check and clean flame sensor. Check for proper gas flow.

1 RED FLASH: This indicates that flame was sensed when there was not a call for heat. With this fault code the control will turn on both the inducer motor and supply air blower. A gas valve that leaks through or is slow closing would typically cause this fault.

2 RED FLASHES: This indicates that the normally open pressure switch contacts are stuck in the closed position. The control confirms these contacts are open at the beginning of each heat cycle. This would indicate a faulty pressure switch or miswiring.


3 RED FLASHES: This indicates the normally open pressure switch contact did not close after the inducer was energized. This could be caused by a number of problems: faulty inducer, blocked vent pipe, bro- ken pressure switch hose or faulty pressure switch.

4 RED FLASHES: This indicates that a primary or auxiliary limit switch has opened its normally closed contacts. With this fault code the control will operate the supply air blower and inducer. This condition may be caused by: dirty filter, improperly sized duct system, incorrect blower speed setting, incorrect firing rate or faulty blower motor.

5 RED FLASHES: This fault is indicated if the normally closed contacts in the rollout switch opens. The rollout control is manually reset. If it has opened, check for proper combustion air, proper inducer operation, and primary heat exchanger failure or burner problem. Be sure to reset the switch after correcting the failure condition.

6 RED FLASHES: This indicates that after the unit was operating, the pressure switch opened 4 times during the call for heat. If the main blower is in a “Delay on” mode it will complete it, and any subsequent delay off period. The furnace will lock out for one hour and then restart.

7 RED FLASHES: This fault code indicates that the flame could not be established. This no-light condition occurred 3 times (2 retries) during the call for heat before locking out. Low gas pressure, faulty gas valve, faulty hot surface ignitor or burner problem may cause this. The furnace will lock out for one hour and then restart.

8 RED FLASHES: This fault is indicated if the flame is lost 5 times (4 recycles) during the heating cycle. This could be caused by low gas pressure or faulty gas valve. The furnace will lock out for one hour and then restart.

9 RED FLASHES: Indicates reversed line voltage polarity or grounding problem. Both heating and cooling operations will be affected. Check polarity at furnace and branch. Check furnace grounding. Check that flame probe is not shorted to chassis.

10 RED FLASHES: Gas valve energized with no call for heat. Check gas valve and gas valve wiring.

11 RED FLASHES: This indicates that a primary or auxiliary limit switch has opened its normally-closed contacts and has remained open for more than five minutes. This condition is usually caused by a failed blower motor or blower wheel.

STEADY ON RED: Control failure. Replace control board.

60-MINUTE AUTOMATIC RESET FROM LOCKOUT: This control includes a “watchdog” type circuit that will reset from a lockout condition after 60 minutes. Operational faults 6,7,8 will be reset. This provides protection to an unoccupied structure if a temporary condition exists causing a furnace malfunction. An example would be a low incoming gas supply pressure preventing unit operation. When the gas pressure is restored, at some point the “watchdog” would restart the unit and pro- vide heat for the house.

NOTE: If a flame is detected the control flashes the LED for 1/8 of a second and then enters a flame stabilization period.








Some Lennox error codes
There are 2 LEDs.
LED#1 LED#2

Simultaneous slow flash Simultaneous slow flash Normal operation

Simultaneous fast flash Simultaneous fast flash Normal call for heat

Slow flash On Limit open

Off Slow flash Pressure switch problem

Alternating slow flash Alternating slow flash Flame failure

Slow flash Off Flame sensed without gas valve on

On Slow flash Flame rollout switch open

On, on, off On, off, on IFC failure or wiring problem

Fast flash Slow flash Power polarity reversed

Slow flash Fast flash Low flame signal

Alternating fast flash Alternating fast flash Low voltage or broken ignitor





These are Goodman error codes

1. Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

2. Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

3. Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.

4. Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

5. Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

6. Interpret five LED flashes to mean your Goodman furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.

7 Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.

8. See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.

9. Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

10. Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.


Rheem failure codes

FLAME LED
The FLAME LED is an indication of the presence of flame.
OFF – No flame is detected.
Rapid Blink – Unexpected Flame
Slow Blink – Marginal Flame Sense
Steady ON – Normal Flame Detected
STATUS LED
The STATUS LED is an indication of a fault present.
Steady ON – Normal Fault detected.
1 Blink – Ignition failure – 1 HR lockout
2 Blinks – Pressure switch stuck open switch will not close when inducer is on.
3 Blinks – Limit switch open main limit or roll-out control.
4 Blinks – Pressure switch stuck closed. Switch will not open.
5 Blinks – Not applicable.
6 Blinks – Line and Neutral reversed.
POWER LED
The POWER LED is an indication of 24ac power to the board.
OFF – No power (24VAC) to control board.
ON – Control is powered.
CFM LED
The CFM LED is an indication of target airflow. This is a reasonably close approximation of the airflow pushed by the blower motor through the furnace.
Because of manufacturing and measurement tolerances, air density, humidity, ambient air temperature and other things, the CFM actually measured may vary significantly from this target value.
One Blink represents 100 CFM of target
airflow. A half blink represents approx. 50 CFM. When the blink sequence is complete, there will be a noticeable pause of approximately one second before the sequence repeats. For example, if eleven and one half blinks are counted followed by a one second pause and then eleven and one half blinks are counted again, the target airflow is approximtely 1150 CFM.