More home repairs! Flame sensor?

[rmk4ever]

So i've done some searching, & im not 100% sure on this. So here it goes, the furnace is propane the thermo calls for heat & the flame kicks on but soon after the flame kicks out while the fan is still spining, now with out shutting down (fan) the flame will kick back on & then shut off again all with in 5 minutes. Looks to be the flame sensor either dirty or out of service?
What's your take?

 

[scottiking]

Sand the thermo coupler/flame sensor! or get a new one! they are cheep and easy to replace!

Scottiking OUT

So i've done some searching, & im not 100% sure on this. So here it goes, the furnace is propane the thermo calls for heat & the flame kicks on but soon after the flame kicks out while the fan is still spining, now with out shutting down (fan) the flame will kick back on & then shut off again all with in 5 minutes. Looks to be the flame sensor either dirty or out of service?
What's your take?

 

[peter]

sounds like the flame sensor to me. Use some #0000 steel wool to clean it or some fine sandpaper. or just replace they are cheap.

 

[yamahauler]

same...if you are that far into it, just replace it.

 

[peter]

sounds like the flame sensor to me. Use some #0000 steel wool to clean it or some fine sandpaper. or just replace they are cheap.

 

[eyeman]

x3. What kind of furnace? Age? I assume the fan you are talking about is the combustion air fan and not the evaporator? The combustion air fan has a paddle switch that confirms that it is running. Be sure it is engaging properly. If the thermo-couple is visible, watch to confirm the pilot flame is hitting it directly. If it's not visible replace it as others have stated. It may be a little more complicated and expensive if it's part of a pilot assembly that might include the automatic sparker that ignites the pilot. It still sounds like you have a reasonable diagnosis of the prob.

 

[snow_monkey]

Rollout or flame sensor went bad for a reason ? Check and make sure your burner tubes are clean. A dirty furnace will kick the sensor.

 

[doomsman]

Check the filter if dirty it will cut out on high limit.
All so check the exhaust stack they can frost up and cause
intermittent fire. Too long or too big may require insulating
the stack.

 

[98panther]

It is lighting for sure? Cause that's what happens when the ignitor goes bad.
But it never really lights, it clicks trying but never does, it'll usually cycle 3-4 times then give up. The fan in the exhaust stays on

 

[rmk4ever]

Thanks to everyone that posted on my prob. It was the flame sensor, was able to clean it up last night (per Scottiking's inst.) it made it thru the night, then I guess it failed alltogether...15 below zero this morn BRRRRRRRRRRRRRRRRR!! Got a new one in & all nice & cozy now. Who's ever going to the ride in that has posted on here I'll buy you a beer or cocktail. Thanks again!!

 

[G]

I keep a spare flame sensor and also an extra ignitor laying around at all times. As has been stated they are cheap. For me they always seem to fail on a weekend.