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Dryer question
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thendrix View Drop Down
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Joined: 04 Feb 2013
Location: Fairmount GA
Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Topic: Dryer question
    Posted: 17 Jan 2020 at 6:56am
My grandmother has a Maytag gas dryer that's about 30 years old and it's having trouble heating. The ignitor will come on and the flame sensor turns the ignitor off like it should then the gas comes on and it lites. After 10 to 20 seconds the burner goes out and it won't relight. I replaced the gas valve coils but no help. I want to fix this dryer if possible because 1) it's better than anything you can buy new and 2) my grandmother is 81 years old and I don't want her to have to buy a new dryer when there's no telling how long she'll need it. Little morbid but truth is truth. Any suggestion? The lint trap is clean and I'm almost sure the vent is open and working like it should
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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im4racin View Drop Down
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Joined: 12 Jun 2017
Location: Garrison ND
Points: 1055 		Post Options Post Options   Thanks (0) Thanks(0)   Quote im4racin Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 7:07am
Try cleaning the flame sensor or replace it. The igniter is on a timer not flame sense. The controller doesn't see flame so turns off gas.
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thendrix View Drop Down
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Joined: 04 Feb 2013
Location: Fairmount GA
Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 7:36am
I'll check that next. That was my original thought because that's how the furnaces that used to be used in chicken houses work but I found somewhere on the internet it said different. That's what I get for listening to the internet.
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 7:57am
yeah 30 year old tech is good stuff... new stuff, not so good....
I 2nd the 'flame sensor'. Probably 'old school'  and 30 years worth of soot finally 'hid' theh flame from the sensor.
hope you have good luck !
3 D-14s,A-C forklift, B-112
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Never burn your bridges, unless you can walk on water
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Ray54 View Drop Down
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4731 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 12:10pm
May not a apply,but if propane it could be the regulater going bad. When not using heater just the water heater had this. The copper pigtail was flacking off and plugging regulater. Replace the copper pigtail from tank and all was well again.
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thendrix View Drop Down
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Joined: 04 Feb 2013
Location: Fairmount GA
Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2020 at 5:48pm
The only reason I'm not thinking regulator is the heat and the water heater both work fine. If a flame sensor can't fix it then I'll look further into the gas lines
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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shameless dude View Drop Down
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Joined: 10 Apr 2017
Location: east NE
Points: 13607 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 12:25am
I think if the thermal coupler is bad, it wouldn't light at all.
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Dusty MI View Drop Down
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Joined: 13 Sep 2009
Location: Charlotte, Mi
Points: 5059 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dusty MI Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 11:33am
Originally posted by shameless dude shameless dude wrote:

I think if the thermal coupler is bad, it wouldn't light at all.

A bad thermal couple will let it light but not stay light.

Dusty
917 H, '48 G, '65 D-10 series III "Allis Express"
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thendrix View Drop Down
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Joined: 04 Feb 2013
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Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2020 at 8:04pm
Who'd a thunk it?? The vent pipe came off. Put it back on, dried a load of clothes like it always has.
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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chaskaduo View Drop Down
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Joined: 26 Nov 2016
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Points: 5200 		Post Options Post Options   Thanks (0) Thanks(0)   Quote chaskaduo Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 12:29am
There's one for the memory bank. Now what was it we was talking about?
1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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Ted J View Drop Down
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Joined: 05 Jul 2010
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Points: 18943 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ted J Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 2:54am
Something to do with a Ferd pickup,,,,,,,,,,,I think.
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19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 5:25am
well THAT'S a new one for me !!
maybe there's some kind of 'draft' sensor ?
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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thendrix View Drop Down
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Joined: 04 Feb 2013
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Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 7:10am
No idea about the sensor but a happy Nana means a pot of vegetable soup
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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chaskaduo View Drop Down
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Joined: 26 Nov 2016
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Points: 5200 		Post Options Post Options   Thanks (0) Thanks(0)   Quote chaskaduo Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 7:19am
Vegetable soup with lots of love. Thumbs Up
1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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thendrix View Drop Down
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Joined: 04 Feb 2013
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Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 12:18pm
Just finished. Man that woman can make some veggie soup
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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Hubert (Ga)engine7 View Drop Down
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Joined: 12 Sep 2009
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Points: 6465 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hubert (Ga)engine7 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 12:33pm
Bet that soup is the best around. Mom had "the touch" and even using the same recipe my wife or I neither one can even come close. With this cool weather just around the corner I hope she made you enough to last a day or two. Glad you got the dryer fixed, don't you love it when it is something simple and takes you forever to find it.
Just an old country boy saved by the grace of God.
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thendrix View Drop Down
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Joined: 04 Feb 2013
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Points: 5088 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2020 at 6:16pm
Hehe. Yeah I hate it when it takes forever but when it happens that way all the time you get used to it
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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DaveKamp View Drop Down
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Joined: 12 Apr 2010
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Points: 6066 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jan 2020 at 7:30am
If the gas dryer is 30 years old, it doesn't suffer from an excess of 'safety brains'... all the protection is basically inside the gas valve... which is essentially the same valving that's used in a furnace, or a hot water heater.

Most likely, the reason the flame went out with the exhaust vent removed, was a rapid decline in the amount of available oxygen... the flame was suffocated... by exhaust... which means you're lucky... could'a been tragic.

If it uses a hot-surface ignitor, the ignitor current flows through a detection solenoid in the valve... if there's insufficient current through that HSI, the gas valve will drop out after about ten seconds.

It has a thermocouple flame sensor of some sort... typically, they're same scenario as an HSI... presence of flame provides a MILLIVOLT, low current signal strong enough to hold in a tiny solenoid in the valve.  no flame, no hold magnet, it will NOT flow fuel without it.

Note that valves will LIGHT without those sensors being satisfied... because there's a 'start circuit' in the valve that can be triggered for a few seconds in order to get ignition, but after a few, that circuit will release, and the flame will go out, unless the safeties have determined that a flame has been attained.
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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