Ignition failure after three attempts then sits for an hour.
My Goodman furnace is less than 3 years old. Occasionally, not always, but now with increased frequency, My furnace will fail ignition and go into the one hour sit and reset mode. The exhaust fan comes on, ignition stick starts glowing, I here a click, then the glow stick goes out. The furnace will not fire. After three attempts, it goes into lockout state for one hour. There is no obstruction in the exhaust stack, and I have a 6" air inlet duct that stops 18" off the floor bringing in fresh air from the attic air space into the furnace room. The attic air is cool, and the inlet pipe is relatively near a gable vent to bring in outside combustible air. The inlet duct is approximately 30" from furnace. Any help will be greatly appreciated. Thanks
Re: Ignition failure after three attempts then sits for...
If your igniter comes on but no ignition, that eliminates the possibility of a bad or clogged pressure switch, high limit or flame rollout switch. Sounds to me like you have a control board, or a gas valve going bad. Could even be some loose, corroded, or faulty wiring. Before the igniter comes on the furnace does a self diagnostics to ensure everything is working, or the furnace will not make it to the igniter sequence. Inducer motor, pressure switch/s, limit controls are closed…then comes on the ignitier, gas valve opens, pilot runners and burners ignite, flame sensor detects the flame, blower comes on and all operations are working.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
if furnace fires up then immediatly shuts off check the flame sensor. make sure it is sitting far enough inside the burner box and has proper continuity. if ur getting ignition failure without having furnace fire up, check proper voltage to hot surface igniter, continuity within igniter
This indicates a open limit switch on the furnace, the heat exchanger is getting to hot therefore the limit switch is opening and not allowing the furnace to work properly. Did the techinician check the limit switch on the unit?
· The furnace control checks for an open main limit (this limit is normally closed). If the limit is open, the furnace will remain inoperable until the limit is closed. During an open limit the circulating air blower will be energized. The status light will blink four (4) times. · The room thermostat reacts to a demand for heat.
· The control will then check to insure that the vent pressure switch is open. If, at this point, the vent pressure switch is closed the control will blink two (2) times and will remain inoperable until this situation is corrected.
· The venter blower is energized.· The vent pressure switch will close when it detects a pressure in excess of its setting. If the pressure switch fails to close the status light will flash three (3) times.
The sequence cannot continue until the pressure switch closes.
· After a pre-purge of about ten (10) seconds the electronic ignition device will be energized.
· After a slight delay the gas valve will open.
· The burners will ignite and the flame sensor will detect the presence of flame. The ignition device will deenergize. If the sensor does not detect the burner flame, the gas valve will close and the ignition cycle will be repeated for a total of three attempts. If, after the third attempt, the presence of flame is not detected, the furnace will go into a lockout condition for one (1) hour. It will then repeat the ignition cycle. This one (1) hour lockout and retry will occur indefinitely.
· Thirty (30) seconds after the main valve is energized the circulating air blower will be activated.
· The furnace will remain in operation until the demand for heat is satisfied.
· Once the demand is satisfied the venter will shut off, and the circulating air blower will shut off after the field selectable time off is attained.
· The furnace will remain dormant until the next demand for heat.
I would check the grounding from the circuit board to cabinet, the ground coming in to the power of the furnace as well as the ground lug in your panel box. These furnaces are polarity specific and the wrong polarity or a loose ground will effect the longevity of the ignitor. Always buy a spare.
Gerge, if you go to website www.energycodes.gov
you can do a heat load calc yourself. Basically, you figure out the sizes of walls, total area of glass. total doors to outside, ceiling area and types of building materials used. It is pretty easy and then you will know for sure. The contractor should be suppling you with one but if not use this, it is free!
There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.
There could be a number of other potential causes.
3-tripped rollout safety switch
4- tripped limit control
Look at the door of the unit for a explaination of the number of flashes of the light. This may get you started in the right direction.