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#1
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Furnace sometimes, but not always, fails to start
I have an oil-burning furnace, with an intermittent problem. Most of
the time when the temperature drops below the thermostat level, it kicks in just fine. But every so often, with no particular regularity, it fails to start. I have to go down to the basement and press the manual restart button (which always works with just one push). I have found no factor that seems to explain when it fails to automatically start. (For example, it seems no worse on particularly cold days, or damp day, etc.) It is just that once every day or so, it fails to come on. I have a service contract, and the furnace is old but has been maintained. A couple service guys have been out to look at it, and each has done a little something, but nothing has definitively solved the problem. (I am embarrassed to admit here that I am NOT the handyman type. I do not watch over their shoulders, and I do not know precisely what they have tried.) I have a guy coming out again in a couple days, and I am hoping to be a little bit better armed with knowledge, and be more involved in the diagnosis. I was wondering if anyone has ideas on what sorts of things could cause this intermittent problem. Thanks. |
#2
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Furnace sometimes, but not always, fails to start
I had a similiar problem, the high voltage transformer might
be going especially if it is older. You can test it by yourself if you have any electrical knowledge. Usually they swing out, make sure the furnace, is off at the main switch. I like to take the transformer out , and put is on the bench. after disconnecting the two wires. Get a lamp cord and connect it to to the wires of the transformer. Get a large screwdriver, with a good plastic insulated handle, put the screwdriver on one of the high voltage electrodes and move it slowly toward the second electrode. The spark should jump at least 3/4 of an inch. Nice and blue. If not your xformer is weak, easy to buy and replace, about $80.00 Check your electrodes on the gun, they should be about 1/8" apart,and about 1/8" in front of the nozzle. While you got it apart, get another good quality nozzle, and replace your old one, with the same specs. Usually .75 to 1.50 @ 80 degrees. Also, check your Cadmium cell and make sure its clean. If it doesn't see a good flame, it will shut the the gun down. Did you change the oil filter? If the air filter is plugged, proper air flow will not flow through the furnace, and shut it down on high limit temp. The oil pressure to the nozzle should be about 100 lbs. Have a pro set up the draft and air over the flame! My 2 cents worth.. wrote in message oups.com... I have an oil-burning furnace, with an intermittent problem. Most of the time when the temperature drops below the thermostat level, it kicks in just fine. But every so often, with no particular regularity, it fails to start. I have to go down to the basement and press the manual restart button (which always works with just one push). I have found no factor that seems to explain when it fails to automatically start. (For example, it seems no worse on particularly cold days, or damp day, etc.) It is just that once every day or so, it fails to come on. I have a service contract, and the furnace is old but has been maintained. A couple service guys have been out to look at it, and each has done a little something, but nothing has definitively solved the problem. (I am embarrassed to admit here that I am NOT the handyman type. I do not watch over their shoulders, and I do not know precisely what they have tried.) I have a guy coming out again in a couple days, and I am hoping to be a little bit better armed with knowledge, and be more involved in the diagnosis. I was wondering if anyone has ideas on what sorts of things could cause this intermittent problem. Thanks. |
#4
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Furnace sometimes, but not always, fails to start
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#5
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Furnace sometimes, but not always, fails to start
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#6
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Furnace sometimes, but not always, fails to start
shebaaa wrote: When you do reset it, does it rumble, or is there a smell of oil or smoke? Well, the sound of the burner kicking in is always a sort of mild rumble, but it does not sound any different from usual when I am doing it via reset. No smell of oil or smoke that I have ever noticed. |
#7
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Furnace sometimes, but not always, fails to start
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#8
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Furnace sometimes, but not always, fails to start
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#9
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Furnace sometimes, but not always, fails to start
On 17 Jan 2007 13:22:47 -0800, "z" wrote:
wrote: I have an oil-burning furnace, with an intermittent problem. Most of the time when the temperature drops below the thermostat level, it kicks in just fine. But every so often, with no particular regularity, it fails to start. I have to go down to the basement and press the manual restart button (which always works with just one push). I have found no factor that seems to explain when it fails to automatically start. (For example, it seems no worse on particularly cold days, or damp day, etc.) It is just that once every day or so, it fails to come on. I have a service contract, and the furnace is old but has been maintained. A couple service guys have been out to look at it, and each has done a little something, but nothing has definitively solved the problem. (I am embarrassed to admit here that I am NOT the handyman type. I do not watch over their shoulders, and I do not know precisely what they have tried.) I have a guy coming out again in a couple days, and I am hoping to be a little bit better armed with knowledge, and be more involved in the diagnosis. I was wondering if anyone has ideas on what sorts of things could cause this intermittent problem. Thanks. My old furnace, I kept the temp low because I didn't have cash to pay for luxuries like heat, so that it came on seldom enough that it had trouble priming itself or getting oil to the burner or whatever before The same infrequency of starting would be the case if you had the thermostat higher but it wasn't as cold out as it actually was. That doesn't mean you're not right about it having trouble pumping the oil. the ignition gave up trying which shut down the pump, so I had to go down and keep my finger on the little red button for a while, then it was good for the rest of the cold snap. A) Are we talking about a mechanical or electronic button/reset? B) Isn't that symptom part of a different problem? I definitely might be wrong about how it works, but I thought once you pushed the reset button, the control energized the furnace for a certain time period before it tripped again. So doesn't that mean there is something wrong with the reset function that you have to hold the button down longer than a second? Or are you saying you held the button down for that entire time period so you were still holding it when it was ready for a second reset? My oil furnace used to have trouble in the control box restarting. Sometimes iirc I could feel the relay vibrating, and I looked into replacing the relay, couldn't find a matching relay that would fit, and eventually the thing settled down, and it's been fine for 5 years or more now. |
#10
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Furnace sometimes, but not always, fails to start
mm wrote: On 17 Jan 2007 13:22:47 -0800, "z" wrote: wrote: I have an oil-burning furnace, with an intermittent problem. Most of the time when the temperature drops below the thermostat level, it kicks in just fine. But every so often, with no particular regularity, it fails to start. I have to go down to the basement and press the manual restart button (which always works with just one push). I have found no factor that seems to explain when it fails to automatically start. (For example, it seems no worse on particularly cold days, or damp day, etc.) It is just that once every day or so, it fails to come on. I have a service contract, and the furnace is old but has been maintained. A couple service guys have been out to look at it, and each has done a little something, but nothing has definitively solved the problem. (I am embarrassed to admit here that I am NOT the handyman type. I do not watch over their shoulders, and I do not know precisely what they have tried.) I have a guy coming out again in a couple days, and I am hoping to be a little bit better armed with knowledge, and be more involved in the diagnosis. I was wondering if anyone has ideas on what sorts of things could cause this intermittent problem. Thanks. My old furnace, I kept the temp low because I didn't have cash to pay for luxuries like heat, so that it came on seldom enough that it had trouble priming itself or getting oil to the burner or whatever before The same infrequency of starting would be the case if you had the thermostat higher but it wasn't as cold out as it actually was. That doesn't mean you're not right about it having trouble pumping the oil. the ignition gave up trying which shut down the pump, so I had to go down and keep my finger on the little red button for a while, then it was good for the rest of the cold snap. A) Are we talking about a mechanical or electronic button/reset? Probably electronic, although it was a slightly large button about the size of the eraser on the end of a pencil which had a distinctly loose and wiggly feel to it. B) Isn't that symptom part of a different problem? I definitely might be wrong about how it works, but I thought once you pushed the reset button, the control energized the furnace for a certain time period before it tripped again. So doesn't that mean there is something wrong with the reset function that you have to hold the button down longer than a second? Maybe. IIRC, the first time I tried it, just pushing the button once didn't make the furnace fire up, so my primitive half-frozen mind determined to hold the damn button down until the furnace fired up or blew up. Then I just stuck with what worked. Or are you saying you held the button down for that entire time period so you were still holding it when it was ready for a second reset? My oil furnace used to have trouble in the control box restarting. Sometimes iirc I could feel the relay vibrating, and I looked into replacing the relay, couldn't find a matching relay that would fit, and eventually the thing settled down, and it's been fine for 5 years or more now. |
#11
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Furnace sometimes, but not always, fails to start
On 18 Jan 2007 13:25:39 -0800, "z" wrote:
My old furnace, I kept the temp low because I didn't have cash to pay for luxuries like heat, so that it came on seldom enough that it had trouble priming itself or getting oil to the burner or whatever before The same infrequency of starting would be the case if you had the thermostat higher but it wasn't as cold out as it actually was. That doesn't mean you're not right about it having trouble pumping the oil. the ignition gave up trying which shut down the pump, so I had to go down and keep my finger on the little red button for a while, then it was good for the rest of the cold snap. A) Are we talking about a mechanical or electronic button/reset? Probably electronic, although it was a slightly large button about the size of the eraser on the end of a pencil which had a distinctly loose and wiggly feel to it. B) Isn't that symptom part of a different problem? I definitely might be wrong about how it works, but I thought once you pushed the reset button, the control energized the furnace for a certain time period before it tripped again. So doesn't that mean there is something wrong with the reset function that you have to hold the button down longer than a second? Maybe. IIRC, the first time I tried it, just pushing the button once didn't make the furnace fire up, so my primitive half-frozen mind determined to hold the damn button down until the furnace fired up or blew up. Then I just stuck with what worked. Well I don't at all know what the problem is, but I just wanted to point these possibilities out. Or are you saying you held the button down for that entire time period so you were still holding it when it was ready for a second reset? My oil furnace used to have trouble in the control box restarting. Sometimes iirc I could feel the relay vibrating, and I looked into replacing the relay, couldn't find a matching relay that would fit, and eventually the thing settled down, and it's been fine for 5 years or more now. |
#12
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Furnace sometimes, but not always, fails to start
DerbyDad03 wrote: Doesn't "sometimes" imply "not always"? Sometimes. Not always. |
#13
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Furnace sometimes, but not always, fails to start
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