...just make sure you do a better job than Francis, OK?
Posted on 02/26/2016 4:36:04 PM PST by Ghost of SVR4
G'evening folks...Just a bit of HOWTO this evening if anyone is inclined.. My furnace started acting up on me two days ago. It would run for about 90 seconds then cut out; blower still ran, then rinse and repeat. I did quite a bit of the googles and came to find it was either a thermostat (main) or a limit switch. Welp, replaced the thermostat (I'll post later in this thread about those interesting findings) and same results. Had to order the L150-40F limit switch because no store around me would sell to the "general public" and the home stores did not carry them. Soooo..Had one flown in from another state. Part? 9 bucks. Shipping? 30. (rolls eyes). Okay, so, new part in. Still the same results.. UGH...its cold here and I have to get this pup fixed.
Turns out, my filtrete filter had bad markings on it. The "airflow" arrow (which I have followed for 15+ years) I believe was marked wrong. I pulled the filter and my furnace came alive and went back to doing its job. I replaced the filter (which was only 4 months old) and checked my input airways the best I could.
So, the furnace is humming along, but when she shuts off, after about 45 seconds it emits white smoke. Not enough to kill ya or set off a fire alarm (I have one in that room as I type). I pulled the the electrodes and nozzle assembly and I admit, a bit gunky so I replaced the nozzle and cleaned things up a bit (note, I did not have to re-gap the electrodes). Got everything back together and still some white smoke comes out after the burner is off (around 45 seconds) and the blower is still operating. It lasts for a bout 45 seconds while the blower is still doing its thing and once that is done. POOF, it all stops.
I'm wondering if there is some residue oil just cooking off after a couple days of cycling so much, or? Any ideas?
I do not believe my home is going to burn down. Yes, yes, I know, call a professional and I probably will since I want to sell the place in six months and want everything tip top for the next owner.
This is just eating at me because I cannot figure it out and these furnaces are not extremely complicated.
Beckett Oil pump AFG, 70/70-A nozzle (replaced) calibrated, Generic burner.. Type II fuel oil.
Anyone seen this before??
Blower problem
...just make sure you do a better job than Francis, OK?
I think your furnace is trying to surrender.
Habamus Papa!
Water getting into tank or cracked supply lines?
Flame sensor?
I had a gas furn that had the ‘would light then shut off problem’ it was a dirty flame sensor. The furn would light but the sensor would not recognize the flame so it would auto shut off
“White smoke” not steam?
Is your oil tank underground?
Sounds to me it is water in the fuel
Checked the tank (via my measuring stick and water test gunk).. Nothing showed up.
Blower running “hot” or “low”?
Where is the white smoke coming out of?
Replaced that piece. I don’t have the actual “light sensor”, just a high limit switch. open at 190, closed at 150.
It is coming out of where the electrodes and fuel nozzle are inserted and filters through “the pump” via the air dial.
Water....sounds like your original problem
Better than black smoke. That happened to us last year, also with a Beckett. We replaced it.
Lmao...I need that. Ha!
I did too. My problem, it turns out, was that some ******* little bug crawled up the gas line going to the burner during the summer, and built a nest in there. A safety device in the gas valve realized there was a problem, and wouldn't let it stay lit.
Call a professional furnace repair guy who actually knows something - else it could get very expensive very fast.
Now wife is getting a good laugh!
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