H-7328 caution light on heater wont work - Optimus H7328 Ceramic Utility Heater

The continuous clicking sound you're experiencing when turning on your Optimus H-7328 heater could indicate a problem with the device. There are a few possible reasons for this issue:
1. Faulty Thermostat: The thermostat controls the heater's temperature settings. If it is malfunctioning, it may cause the heater to click repeatedly as it tries to regulate the temperature. In this case, you may need to have the thermostat repaired or replaced.
2. Loose Internal Components: Over time, the internal components of the heater can become loose due to regular use or transportation. Loose components, such as fan blades or heating elements, can create clicking or rattling sounds when the heater is turned on. You might need to open up the heater and tighten any loose parts, or have a professional examine and repair it.
3. Defective Fan Motor: If the clicking sound is accompanied by a malfunctioning fan or if the heater has a fan-forced operation, it's possible that the fan motor is faulty. The clicking noise may indicate that the fan motor is struggling to start or is hitting against something inside the unit. Repair or replacement of the fan motor might be necessary.
4. Electrical Issues: Clicking sounds can also be caused by electrical problems within the heater. Loose or damaged wiring can create intermittent connections, leading to clicking sounds when the heater is turned on. It's important to exercise caution with electrical issues and consult a professional or contact the manufacturer for assistance.
To accurately diagnose the specific cause of the clicking sound and determine the appropriate solution, it is recommended to contact the manufacturer's customer support or consult a professional technician who specializes in heater repairs. They will be able to provide more specific guidance based on the make and model of your Optimus H-7328 heater.
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when did this started happening?

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Sounds like the heating elements are dirty. needs to be unplugged and cleaned out. Caution light means elements have overheated.

Try turning it off and unplugging it for five minutes. That worked for mine.

Try calling 1-866-876-4332 ext 224 for tech help, it worked for me.  I only needed a temp
setting/off switch to fix mine.

I also have the model 5620. with the yellow caution light on. After taking the unit completely apart I found 2 thermal fuses on the bottom of the unit(appox. size of a nickel). They are located under 'U" shaped brackets which are below the medal heating element. The thermal fuses do not reset. you could test them with a drip or two of souder or wire on the top - if you ran the heater this way it would be a safety problem as the fuse would be overridden. I am throwning mine away.

Underneath the heater element are two thermostats that are run in series with each other. Inside the wire that connects them is a thermal fuse that opened up. Replacing the fuse corrected the problem.

MILKHOUSE HEATER "CAUTION LIGHT" SOLUTION: Before I explain, let me clear this myth up: this is NOT an issue with the pendulum safety switch (some mistake that for a "mercury" switch). To begin, unplug the heater. Open it up and clean it out. I mean, buy a can of non-chlorinated brake cleaner and squirt all of the contacts good. Below the fan there is a sensor mounted on the heater element box on the bottom. That goes bad and causes it to trip. While you are there, squirt the motor bushings good with the brake cleaner and dab a drop of synthetic motor oil (just a drop) on EACH of the two motor bushings. Personally, I rewired this and bypassed all of the safety features. You can bypass that sensor without soldering or cutting any wires. All you have to do is unscrew the wires from the holder and then unscrew the tiny nuts and tiny bolts. Then bolt the together at one end (note the position) and put it back in the holder and tighten the screw to hold it in. This method fixes the issue completely as it removes the sensor from the equation. In fact, I just did that on my third milkhouse heater and it has been running solid for the last 15 minutes. Use your modified heater with caution! Let the brake cleaner dry before you energize this device!

According to the manual, the "Caution Light" means that the unit has overheated. They suggest running on a lesser setting, but you also may want to see if you can return the unit (if it is still under warranty).