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Old oil furnace won't start

Need someone who knows how to troubleshoot older oil furnaces.

the oil filter and spray nozzle have been replaced, there is no air in the line and the tank is full but when you hit the reset button it runs for about 30 seconds and then shuts off, its like it won't catch (take off)

very frustrating during winter time, any ideas?

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  • 306 Answers

You have a flame rectifier that has to sense the flame. Try cleaning it just looks like a small round device off to the side. They get covered with soot and can't prove the flame is on. Let me know how it goes. ken

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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No a miller furnace I was told a nozzle was for homes and b was for mobile homes furnace. I have a miller furnace I want to put what is the right one in can you help me


Did you have an old nozzle to look at? The one that you're replacing? The Miller gun furnace for mobile homes is probably a .75 gal/hr. nozzle or less. You need a furnace tech to look at your furnace if you can't read the info. stamped on the nozzle. It will have a .75, or .65 maybe gal/hr rating and a number for the angle in degrees.Like 80 degree nozzle.
If you match up what came out of it,you should be fine. don-ohio (:^)

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Oil furnace


Need to replace the fuel line filter, replace the nozzle, and adjust the igniters. Igniters are set to a 5/16 gap across 1/2 " above the hole of the nozzle, and 1/16" forward of the nozzle.

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I ran out of oil on Wed. On Fri., they brought me oil, but I cannot get my furnace to run. I think maybe it pulled some trash into the line. What can I do?


You need to replace the inline filter and the spray nozzle. If you've never done it or don't know how have a trained professional come do it and watch him foe next time. Everytime you fill the tank with oil it will kick up some debris. So you need to at least replace the filter after filling up and it's not a bad idea to do the nozzle at the same time. Good luck!

Mar 02, 2015 | Heating & Cooling

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Can you tell me what nozzle and filters I need to clean my furnace?


Replace filter with same size currently used (unless filter doesn't fit ) , and use a pleated style filter of the cheaper type . There mar be a wall or ceiling mounted filter on return air vent or a filter inside front of heater .

Oct 02, 2014 | Heating & Cooling

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see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
If there is not enough heat, raise the thermostat setting five degrees to see if it turns the unit on. If the unit still does not generate enough heat, check the comfort controls . Clean or replace a dirty filter, clean the blower assembly (see the Forced-Air Distribution Fix-It Guide), and make sure that all registers are open and not blocked.
If the furnace turns on and off repeatedly (cycles), clean or replace the filter; and clean the blower assembly (see Forced-Air Distribution Fix-It Guide).
If the furnace is noisy, make sure access panels are mounted and fastened securely; spray squeaking belts with fan-belt dressing and replace worn or damaged belts; adjust the blower belt; lubricate motor and blower oil ports.
If the element does not heat, refer to the Heating Element Fix-It Guide for guidance.

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Rheem Highboy Oil Furnace runs, then shuts down. I throw in a lit paper to burn off oil residual from failed start. Hit 'Reset' button and furnace starts up. It may start up by itself for the next 3...


Oil furnaces have certain items that routinely go bad or need adjusted to work properly.Some of the common things are nozzle, then gap and location of the igniter,then last is the fire eye. You can see all of these items by pulling the burner tray out. The nozzle delivers the fuel in two ways more or less, first is spray angle then second is the rate or GPH. Nozzles are to spray an atomized mist this means no heavy droplets of fuel. If you have large drops of oil chances are a new nozzle can help you out, please pay attention to spray angle and GPH. The igniter is next, after time they will wear and you can clean the rods and reset the gap to specified distance, that being said it also needs to be a certain distance from the atomized fuel to ignite properly all very important. Then last is the fire eye it tells the furnace that a flame is established and to deliver fuel or flame out and shuts fuel down. These will build carbon deposits at times so simply clean off the deposit and clean the lens with a soft cloth and windex reposition put the burner tray back in hook up the fuel line and off you go.

Dec 20, 2010 | Heating & Cooling

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Where is flame sensor on my old oil furnace?


Thanks for your question,
The flame sensor eye is located just under the transformer, it is looking straight down the burner assembly to where the burner chamber is at, you will have to remove the entire assembly to get to it, first make sure the power is off, remove the transformer, then remove the entire burner assembly from the furnace cabinet, once removed you can see the flame sensor window, use a clean oil free cloth to clean it, it would probably be a good idea while you have it out to replace the burner nozzle, as over time they will clog, I hope this helps you fix your oil burner, let us know and rate this please, thanks again,
mr.grzz

Jan 27, 2009 | Heating & Cooling

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Furnace wont stay on


Have you checked to see if oil is coming out of nozzle? you should be able to put a flash light in the axcess hole. Is there sparks going acrosas electroides? Has furnace filters and oil filter been chanded, and furnace been cleaned?

Jan 20, 2009 | Goodman GMS90703BXA Heater

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Furnace rumbles when it turns on


varies from burner to burner to burner , should replace with the same as you removed , the numbers are very important on the nozzle one of the numbers is the degree of the fire pattern the nozzle produces ex. a 90 degree or 80 degree etc . this is determined by the way the fire box in the furnace is insulated . the other number is gallons per hour of oil the furnace is set up to use , ex. .70 gph or .80 gph all of these numbers are critical and should not be changed except by an expert or you could damage your furnace and could possibly be dangerous . the numbers will be on your old nozzle and should go back with same one , as to the adjustment , they also vary ,but i can give you one that will usually work for most furnaces , that is one eighth inch space between electrode tips , five eights in front of nozzle port opening , and one half inch above center of nozzle center , where the hole is . bleed all air out of system after installing nozzle , let me know if no fix have more ideas

Nov 21, 2008 | SySTOR Systems (400S52) Burner

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