Here are your parts
Replacement parts for WHIRLPOOL LER5634AW0 | AppliancePartsPros.com
Here is the wiring diagram
I am assumning that the drum rotates OK
First thing to check is the power. Flip the breaker off/on slowly a couple times.
Sometimes you can loose half the line without actually tripping the breaker and the heater requires both sides to get 240 volts.
Better yet check it with a meter.
Next would be the heater itself, then the thermal fuse (Item 7 in Section 3) then the thermostats.
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.
There is a good STICKY at the start of this forum about it's use.