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Replacement parts for Roper RED4440SQ0 29"ELECTRIC DRYER | AppliancePartsPros.com

See the attachment for the wiring diagram.

No heat can be a bunch of things.

Try flipping the breaker off/on slowly a couple times. Sometimes you can loose half the line without actually tripping the breaker.
Check the voltage at the plug
L1 to L2 should be 240 volts
L1 to Neutral and L2 to Neutral, both should be 120 volts.
If OK
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
If OK
Check the power at the terminal strip.
Do this with the heater off and on.
[COLOR="Red"]Be careful as 240 volts is lethal !!![/COLOR]

Looking at the wiring diagram, the timer runs off of 240 volts when in timed dry. Put the unit to mid cycle timed dry. If the timer advances then you have 240 volts. Doing it this waay is safer than poking around 240 volts with a meter.

If OK
Next I would check the heating coil. They are usually 8 to 12 ohms.
If OK.
Check the thermal cut-off (Item 9 in Section 1). It should be 0 ohms.
If it is blown get post a reply as you have to find out why it blew.
If OK
Check the other thermostats. Both should be 0 ohms.

If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.
4. When you start always short the meter leads together. This will tell you that the meter is working and if there is any 0 offset.

There is a good STICKY at the start of this forum about it's use.