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Tim2020  
#1 Posted : Saturday, April 26, 2014 7:52:57 PM(UTC)
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Tim2020

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Dryer will not heat, checked all thermostats and heating element. The timer advances and shut off at the end of cycle. The drum turns and blow out cold air on all settings. I checked with meter The black lead(hot wire) to the timer this is what I got, red wire 10-12 ohms, little black wire on timer 0 ohms, black wire 0 ohms, brown wire on timer 0 ohms, dark blue wire to start switch 1-2 ohms , light blue 1-2 ohms, purple 9-10 ohms, orange wire 10-12 ohms, white wire 10-12 ohms, brown on timer 12 ohms. Now from the black lead (hot) wire to the start button, black doesn't move infinity?, dark blue, light blue and white all are 1-2 ohms From the black lead (hot) wire to the thermal cutoff both are 10-12 ohms, to the heating element 10-12 ohms. to the cut off fuse 1-2 ohms. to the thermostat on the blower the 2 big are 10-12 ohms, 1 of the little ones is 10-12 ohms the other little one is 1-2 ohms. Sorry this is so long but thought it might save some time to tell you what I already know. Is this a timer or wiring problem since all the thermostats and heating elements are showing good? If not what else could it be? Thanks in advance.
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denman  
#2 Posted : Sunday, April 27, 2014 5:45:09 AM(UTC)
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denman

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Here are your parts
Parts for Estate TEDS740PQ0 Dryer - AppliancePartsPros.com

See the attachment for your wiring diagram.

[COLOR="Blue"]The timer advances and shut off at the end of cycle.[/COLOR]
Does it do this in both timed dry and auto cycles re: the circuit path is different for these modes.

[COLOR="Blue"]I checked with meter
The black lead(hot wire) to the timer this is what I got,[/COLOR]
Are you saying that the black wire (L1) was the reference side of the meter re: one meter lead was always here.
Also knowing where the times was set would be useful.

Sorry but your meter readings do not make sense to me.
As an example "red wire 10-12 ohms"
If you are measuring black to red on the timer it should be 0 ohms if the timer is set mid scale on a heating cycle instead it looks like your are reading the heater resistance.

[COLOR="Blue"]brown wire on timer 0 ohms,[/COLOR]
I do not see a brown wire at the timer
Sorry but I am confused.

Looks like your power is OK as the timer advances and it and the heater use 240 volts.

Set the timer to mid scale high heat.
Use your most sensitive meter scale. It is a good idea to short the meter leads together before starting just to see if there is a zero offset in the meter.
Clip or tape one meter lead to the L1 prong on the line cord and leave it there.

Now measure to the L1 (black) on the terminal strip should be 0 ohms.
Now work your way back through the heater circuit.
All the following should be 0 ohms.
red wire on timer
both sides of the thermal cut-off
both sides of the operating thermostat contacts (outer two connectors) (inner two are it's internal heater)
both sides of the hi-limit thermostat
one side of the heating coil

The other side of the heating coil should be 0 to 12 ohms
Also 1M at the motor's centrifugal switch.
File Attachment(s):
TEDS740.pdf (232kb) downloaded 6 time(s).
THIS FORUM IS DEAD!!!!!!!
Tim2020  
#3 Posted : Sunday, April 27, 2014 10:36:25 AM(UTC)
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Tim2020

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Originally Posted by: denman Go to Quoted Post
Here are your parts
Parts for Estate TEDS740PQ0 Dryer - AppliancePartsPros.com

See the attachment for your wiring diagram.

[COLOR="Blue"]The timer advances and shut off at the end of cycle.[/COLOR]
Does it do this in both timed dry and auto cycles re: the circuit path is different for these modes.[COLOR="Red"][/COLOR]yes all cycles

[COLOR="Blue"]I checked with meter
The black lead(hot wire) to the timer this is what I got,[/COLOR]
Are you saying that the black wire (L1) was the reference side of the meter re: one meter lead was always here. yes[COLOR="MediumTurquoise"][/COLOR]
Also knowing where the times was set would be useful. It is set on 30 min. high heat timed dry

Sorry but your meter readings do not make sense to me.
As an example "red wire 10-12 ohms"
If you are measuring black to red on the timer it should be 0 ohms if the timer is set mid scale on a heating cycle instead it looks like your are reading the heater resistance. I went from L1 black wire to red wire on timer

[COLOR="Blue"]brown wire on timer 0 ohms,[/COLOR]
I do not see a brown wire at the timer
Sorry but I am confused. It's a little brown wire going from one side of the timer to the other

Looks like your power is OK as the timer advances and it and the heater use 240 volts.

Set the timer to mid scale high heat.
Use your most sensitive meter scale. It is a good idea to short the meter leads together before starting just to see if there is a zero offset in the meter.
Clip or tape one meter lead to the L1 prong on the line cord and leave it there. made sure of zero offset

Now measure to the L1 (black) on the terminal strip should be 0 ohms. 0 ohms
Now work your way back through the heater circuit.
All the following should be 0 ohms.
red wire on timer 10-12 ohms
both sides of the thermal cut-off 10-12 ohms
both sides of the operating thermostat contacts (outer two connectors) cycling thermostat (big red wires) 10-12 ohms(inner two are it's internal heater) purple wires( little) 1 of them 6-8 ohms the other is 0 ohms
both sides of the hi-limit thermostat 10-12 ohms
one side of the heating coil both sides are 10-12 ohms

The other side of the heating coil should be 0 to 12 ohms both sides are 10-12 ohms
Also 1M at the motor's centrifugal switch.
10-12 ohms
denman  
#4 Posted : Sunday, April 27, 2014 11:20:09 AM(UTC)
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denman

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Sorry but I do not understand what "10-12 ohms" means.
THIS FORUM IS DEAD!!!!!!!
Tim2020  
#5 Posted : Sunday, April 27, 2014 11:43:01 AM(UTC)
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Tim2020

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Originally Posted by: denman Go to Quoted Post
Sorry but I do not understand what "10-12 ohms" means.


The meter is showing somewhere between 10 and 12 ohms.
denman  
#6 Posted : Sunday, April 27, 2014 12:16:09 PM(UTC)
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denman

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Yes but where.

I need to know where the meter leads are.

Did you measure the heater circuit as I outlined in my earlier post and if yes what were the results?
THIS FORUM IS DEAD!!!!!!!
Tim2020  
#7 Posted : Sunday, April 27, 2014 12:46:23 PM(UTC)
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Tim2020

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Originally Posted by: denman Go to Quoted Post
Yes but where.

I need to know where the meter leads are.

Did you measure the heater circuit as I outlined in my earlier post and if yes what were the results?


denman, in your earlier post I quoted you and posted the results. I tried to put the results in a different color to make it easier for you to read. It wouldn't let me so I put a space in between. I put one lead from the meter on L1 and the other where you told me to. I know its kind of hard to see,but if you'll look at the post I quoted you in, I posted the results. Sorry for the confusion, and thank you very much for trying to help me.
denman  
#8 Posted : Sunday, April 27, 2014 2:46:43 PM(UTC)
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denman

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I am going to have to sit down and go through this.

It looks like you are reading the heater resistance but I cannot for the life of me see where there is an alternate circuit path.

Just to check - did this dryer did used to work for you, correct?
Or is it new to you as it could be someone has messed with the wiring.

You could try disconnecting the red wire from the timer and then measuring just across the timer contacts.
THIS FORUM IS DEAD!!!!!!!
denman  
#9 Posted : Sunday, April 27, 2014 5:43:31 PM(UTC)
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denman

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OK I'm back

[COLOR="Blue"]The other side of the heating coil should be 0 to 12[/COLOR]
I screwed up when I said the above. It should be 8 to 12 ohms.

[COLOR="Blue"]both sides of the operating thermostat contacts (outer two connectors) cycling thermostat (big red wires)[/COLOR] [COLOR="Green"]10-12 ohms[/COLOR]
OK the 10 to 12 ohms is bad.
So measure black to red at the timer but with the red wire disconnected. This should be 0 ohms as you as measuring across a set of closed contacts in the timer and have isolated it from the rest of the circuitry.
If you still get 10 to 12 ohms then the contacts are bad and the timer needs replacing.

[COLOR="Green"](inner two are it's internal heater) purple wires( little) 1 of them 6-8 ohms the other is 0 ohms.[/COLOR]
These also seems weird.
Contacts BK to V should be open (infinite ohms) when in high heat.
I hope I do a decent job explaining this.
So using the wiring diagram.
When your reference meter lead is on L1 then the current/meter circuit path is BK at the timer to BU since BK to V is open but BK to BU is closed in high heat.
Then through the thermal fuse, through the motor windings to the right hand side of the thermostat heater (on the wiring diagram).
This should measure about 1.5 ohms. This is the motor windings.
On the left hand side of the thermostat heater you should see about 5,600 to 8,400 ohms.

[COLOR="Green"]both sides of the hi-limit thermostat 10-12 ohms
one side of the heating coil both sides are 10-12 ohms[/COLOR]
These two is what I would expect as you also saw this at the BK to red measurement.

[COLOR="Blue"]The other side of the heating coil should be 0 to 12 ohms both sides are [/COLOR]
As I said earlier this is my error as it should be 8 to 12 ohms.

[COLOR="SeaGreen"]both sides are 10-12 ohms[/COLOR]
Here we get weird again.
Using the wiring diagram.
You would expect to see 10-12 ohms on the left hand side of the element since even if it indicates a problem it is what you have seen in the circuit so far.
But the right hand side should be the 10 to 12 ohms plus 7.8 to 11.8 ohms (the heater resistance) because that is now added to the circuit.
Note the 7.8 to 11.8 is the 8 to 12 ohms that I mentioned earlier I just round it off to 8 to 12.

I hope that I have not confused the livin out of you.
After a lot of years this stuff is second nature to me but I am not very good at explaining it.

So in conclusion I would say that the timer needs replacing.
The heater not adding in when you checked it bothers me but I am at a loss as to why this is.

Before ordering a timer I would check the heating coil.
Undo both wires at the heater.
Then measure the heater it should be between 8 and 12 ohms.
Then measure from each heater connector to the frame/case, both should measure infinite ohms.
You are checking to see if the heater is OK and that it has not sagged and is touching the case which is a bad thing.
THIS FORUM IS DEAD!!!!!!!
Tim2020  
#10 Posted : Sunday, April 27, 2014 8:36:59 PM(UTC)
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Tim2020

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[COLOR="Red"][/COLOR]
Originally Posted by: denman Go to Quoted Post
I am going to have to sit down and go through this.

It looks like you are reading the heater resistance but I cannot for the life of me see where there is an alternate circuit path.

Just to check - did this dryer did used to work for you, correct?
Or is it new to you as it could be someone has messed with the wiring.
denman this is a friends dryer, as far as i know it was working fine then just stopped heating. he said he thought it was the timer because he checked all the thermostats and heating elements so he might have messed with the wiring I don't know. He asked me if I would look at it (I'm not a repair man as you can tell) because I had done a couple simple repairs before.
You could try disconnecting the red wire from the timer and then measuring just across the timer contacts.

After I remove the red wire then I take the meter and measure where the red wire was to the black wire? Is this correct? What should the reading be?
And how do I change my reply to a different color? Thanks again.
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