Bottom elements are out - Holman QCS1-350 Compact Conveyor Toaster

Your wiring diagram and parts schematics are here in the link below. Normally the bottom element does glow read hot after a couple of minutes. Broil elements last a lot longer because they aren't used as much. There is only one Control Board. If I was guessing, I would say the temperature sensor is at fault. Elements either work, or they don't, but you can easily test continuity with a meter. Many parts are discontinued.

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The top element needs to satisfy before the bottom element turns on.

the upper element only comes on when you broil or clean with selfcleaner. the bottom comes on when you are baking, it sounds like your bottom element is bad.

check thermostate control sensor its locate behind the heating element. check continuty .if its fail .replaced correct value.
GKM

The top element only comes on when the heater is about out of water. The water is directed to the bottom of the tank. Cold water stays on bottom, Bottom heater element heats water. If you use all that water then the top of the tank gets cold and the top element comes. When the top of the tank is warm, then the bottom element comes on. I would susupect the bottom element as it does most of the work. If you have an ohm meter, turn off electric, and remove wires from element. Check element for continuity. If you don't get reading, then that element is bad.

The elements do not operate at the same time. They are designed to take turns coming on. Try setting the temperature of the top element 10 degrees lower than the bottom one, turn the hot water on in the bathtub. The bottom element should come on first. When you are done checking, turn the top element 10 degrees higher than the lower for normal operation.

Hi!!

If you just start the oven normally, only the bottom element comes on, If you select the broil option, then the top element comes on and the bottom turns off.

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NOPE!

1. Broil element does not have welded-on legs and will touch the bottom of oven, overheating itself and will end up the same way your bake element did; besides, the bottom of the oven will corrode pretty quick
   
2. Many ovens use both elements during bake cycle
3. self clean cycle uses broil element
4. The bake and broil elements typically have different mounting brackets and screw holes ate in different places
   
5. you'd have to cover the hole, left after removing the broil element, and insulate the wires, which went to broil element
6. the ends, protruding behind the mounting bracket may have different length and different connectors. you may end up shorting the wiring to the casing, which may in turn destroy the control board if there is one
7. Bake elements usually cost only $40-$60. No jury rigging required.

Hope this helps ;)
Good luck!

Sounds like bottom element may be bad but usually reads open circuit if bad. Also tan k would run about 8 gallons hot water then go cold. lots of warm water usually means bad dip tube.
Check if tank is hot at bottom element when not used for a while. If bottom element is still cold then bad element.
If bottom element is hot - (all water in tank is hot then you have a bad "dip tube" This is allowing incoming cold water to mix with outgoing hot water. The dip tube is usually A part of the cold water nipple or B located under the cold water inlet nipple.

There will be no current to bottom element until top element shuts off. then top thermostat will send current to bottom element only after the top half of the water heater has heated up and shuts off current to top element. Only one element at a time can be on. If current still does not go to bottom AFTER top element shuts off, the top stat could be bad.