The fan comes on but the burner won't kick on and then shuts off
Last time I used it the heater would run a litte bit shut off , a minute later turn back on did that a few times and then blew a big puff of smoke. now plug it in the fan turns on but the burner won't kick on and it shuts back off.
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Re: the fan comes on but the burner won't kick on and...
Check your fuel line for cracks and also the air line. Most likely is the CAD flame sensor, easy to change and only 3 bucks or so. Might also want to check all of your filters. Mine was doing the same thing and it was the high heat limit control and the flame sensor.
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It sounds to me like your thermostat may be bad. I would check power incoming to t-stat then turn temp. setting up and down to see if it is switching on and off. If not then replace. If it does then I would check all wiring to gas valve and if power is shutting off to valve but burner continues then replace gas valve. Thank you.
Is it the Furnace (Oil burner) that is running, (on idle you called it..) or is it the FAN that is running? What are you tapping, that shuts off what? Is the fan that blows the air around the home shutting off, or the burner? (When the burner is running, there is a loud roar!-- the fan should be much quieter..)
If it is the fan that is running,-- I might ask, is the air coming from the registers too cold?-- for with the fan running, you are getting all the heat from the oil that was burned. But naturally, you don't want it to be uncomfortable.. So-- you can open the cover on that Fan control switch, and raise the temperature at which the fan turns ON and OFF..
Sounds like the low limit or high limit is out these control the fan motor.They are usually set to kick on around 150 degrees and set to go off around 95 to 100 degrees. Over heating does happen with cracked heat exchangers and it can possibly take these two items out. Normally your furnace should run approximately five minutes or a little less then your fan motor comes on and then for cooling down burners should drop and the fan motor should run again roughly five minutes or so then shut down. Times may vary as to your settings.
its the fan control AFC not shutting off , it comes on at temp rise say 150f drops back to 130f with fan on , burner shuts off fan runs untill temp falls to 100f the fan shuts off in this case it keeps running
Turn off the power to furnace.
on the last burner to light there is a small metal rod in front of the burner. This is a safety called the flame sensor. It is dirty. Unscrew it from the bar ( 1 Screw) unplug the connector wire from it and clean it with steel wool. it will be kind of burnt. Plut back in place and turn on the furnace to cycle.
The furnace could be shutting off on High Limit ...means your furnace is running too hot...check your filter and make sure return air vents are clean and clear....also it can be the Heat anticipator in your thermostat...which controls how many times your furnace cycles...basically your furnace should come on and off 5-6 times/hr ....need more info on your type of furnace and type of thermostat