Oil furnace shuts off suddenly


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Old 10-27-13, 09:40 AM
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Oil furnace shuts off suddenly

Hello. Hoping someone can shed some light on the problem we are having . We have central heat fueled by oil. We are having this problem where the furnace just shuts down. It shuts off completely. Under normal working conditions, when it reaches the set temp of the thermostat it shuts the blower off and it has a cool down period where its running and then shuts off. With this problem, it shuts off completely and you can smell a strong heat smell throughout the house. I open the panel to the furnace to press the reset button once like they tell you but the reset button isnt popped up. The heater wont turn back on. If we wait about an hour or so, it turns back on and starts working. Its really frustrating because we call the oil company techs and by the time they come down within a few hours, it works and they cant seem to find the problem. This furnace was recently tuned up, so it shouldn't have a problem with dirty oil filters or nozzles. The tech said the strong smell is not the problem because its only smelling because the heater shut off suddenly without having a cool down period. The question is, why is it shutting off suddenly? Help, please.
 
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Old 10-27-13, 09:55 AM
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Sounds like it shutting off on hi limit.When it does it again shut unit off and go and touch the blower motor and see if it's hot. Good luck.
 
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Old 10-27-13, 10:22 AM
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Thanks for the reply. Would this make the furnace shut off suddenly without a cool down period? Should the Hi limit be adjusted? Isn't this in place to prevent burnout?
 
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Old 10-27-13, 10:31 AM
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Sometimes the fan limit will stick, that's why you feel the motor and if it"s hot it's something to do with it.If it feels ok then it's the limit more then likely.
 
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Old 11-12-13, 04:46 PM
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Several oil techs have been over since the initial posting and they are still not sure what the problem could be. Most recently, they thought it was the switch that cuts power off to everything when you open the blower compartment. They bypassed that switch are they are going to replace. However, it shut down again several hours after so thats not causing the problem . There is another possibility. When it shut down this evening, i turned the emergency shut off to the off position and back to on and switched it on and off a few times and it turned on after several times of doing this. Could there be something wrong with the switch?
 
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Old 11-12-13, 06:16 PM
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Any power stoppage while it trying to shed heat will make it smell hot.Would need to meter it out when it was down.
 
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Old 11-21-13, 08:14 AM
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It appears that the problem is finally fixed. Its was the relay that switching the burner on and off. Its shutting off and turning on normally now. Thanks for your help
 
 

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