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Re: Electronic ignition is not working on my goodman...
It means the high limit switch is staying open , it is there to keep the unit from over heating. it have went bad , it is the small square peice with two wires going to it on the heat exchanger could be black or brown
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Reset the power to see if the furnace tries to light. If it tries & fails, it is an ignition issue ie hot surface igniter, dirty flame sensor. If the LED's still are lit up, it is most likely a limit that is open.
Hi, The 4 blinks means that the high limit switch or the regular limit switch are tripped... try to find the high limit switch... it is usually near the blower...there will be a red reset button in the center of it... push it in and the unit should work again... if the regular limit switch is kicked you may have to replace it for the unit to work again... This often happens after a power failure if the unit was running at the time of the failure. If you did not have a power failure, then find out why the limit switch kick out...
Here is a tip that will help you try to figure out why yourfurnace is not working.
What about the safety limits for over heating? You have tackled all obvious problems, I am only throwing this out there because while the high limit is jumped out, to get the open high limit is definitely strange. So i would be tracing my wiring backwards from the relay to see what else is in line with it. This is not a solution but only a suggestion before running out to purchase the main control board, as most places will not accept a board back if that is not the culprit. Good luck with this one it leaves me slightly puzzled??
· 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.
On Goodman furnaces, 4 flashes usually means open high limit. Look for any burnt or loose wires or any resettable limits, they should have a red button that clicks when you push on it and wire going in and out of it with spade clips. If the open limit is not resettable, jump it out to verify its open and if that fixes the problem, replace the defective limit. Best of luck.
check for a reset able round limit switch in the burner area if fires up make sure filters are clean and no signs of flame roll-out in the burner area when fan comes on this furnace should still have mfg parts warranty left
There is a Primary High Limit Switch towards the middle of the furnace, it more than likely needs to be replaced, very common to go out only after a few seasons. Also, you could have a flame rollout switch tripped that will signal the same code, these switches are re-settable and are located on the outer, top and sides of the burner assembly, they’re about ½ inch in diameter with a red push button in the center and two wires “ usually purple” coming off of them.
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.