RUUD Achiever 90 gas furnace ignitor doesn't light
I have two same furnaces...one ignitor won't lit up. i have replaced it with a brand new one (didn't lit) and used the one from the other furnace...and it doesn't lit up. i have power to the furnace...i can hear ignitor click...but won't light up. please help.
model: RCBA-3765GG17XI
That is the model number for the A/C coil.
You need to check the ID label inside on the side wall near the burner.
The click you are hearing is a relay but may not necessarily be the one for the igniter.
On the other hand..... it could be for the igniter and bad.
Does the control board fault LED indicate an igniter problem ?
The igniter won't get powered until the pressure switch proves closed.
Thank you for your replies.
After following the steps on how the furnace starts...i used the multimeter to check...and found out that my pressure switch was the problem. i switched the one from my other furnace and replaced it just to check...and it worked!
thank you soooo much for your inputs and help!!
ok...so i ordered a new pressure switch and the furnace worked for about 3 days...then same problem happened. i thought it was a bad pressure switch and ordered another one. the new one again..worked for about 3 days and it stopped working. now i am guessing it's not the pressure switch problem. any ideas what to change next?
I’d start looking at the condensate tubing.
Your not going to fix problems by replacing random parts, and the error code isn’t there to tell you what parts to replace.
The pressure switch connects to the furnace at what used to be a barbed connector but today is just a 1/8 inch nipple. This 1/8" connection point can become restricted with dirt over time. It should be cleaned before ever replacing the pressure switch.
A straightened paperclip can be used to clean the pressure switch port on the opposite end of the pressure switch tubing ( furnace side).
Ream out the pressure switch port with a straightened paper clip.
I recommend cleaning the nipple to the pressure switch tubing.
Greetings! First post here, looking for some help.
I've got a Trane XV80 that is not producing any burner flames. I've read a number of posts and watched a bunch of videos and this is where I've got to:
Sequence
1) Thermostat calls for heat.
2) Draft inducer starts running.
3) Pressure switch proves vacuum from draft inducer.
4) Igniter starts heating as long as pressure switch has proven.
And here things hang. I do not think the gas valve is opening.
Furnace makes three attempts to ignite, then goes into "2 flashes" EXTERNAL LOCKOUT (RETRIES OR RECYCLES EXCEEDED)
That seemed to indicate the gas valve or the control board. I checked voltages at several places on the control board and find 26-28 VAC. I checked voltage between C and Hi on the gas valve and get only a few mV. Same between C and M, with a brief flash to about 16 VAC. Seems like the control board.
By lucky circumstance I had another control board. I put that in and turned the furnace on. Start-up went smoothly, igniter came on, gas valve opened, and the burners lit!
The burners stayed on for about 30 seconds, then went out, and we are back to where I started. The start-up sequence proceeds through the igniter glowing, no burners ignite, the system resets, and the cycle repeats.
Now what? What else could be preventing the control board from opening the gas control valve? Is the gas control valve coil bad? Could it be damaging the control board? How can I test that?
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I have a gas ( propane ) furnace in my home ( attic ) and it keeps turning off and on ( short cycling ). Replaced the flame sensor but is still doing it. Thanks....... Steve
12-08-22, 02:23 PM
