Sounds like your hot light is good. They are usually set to trip at 240 degrees.
If you have trouble getting het out of any setting, then I would start with replacing all vacuum lines for heater. Also, there is often a vacuum switch at the control levers which may leak and is virtually impossible to repair successfully and made from unobtanium.
The suggestions for flash the system is always a good start but also I would check to see if someone replaced the pump with one of those stamped impeller replacements. If so, throw it as far as you can and get a cast impeller model.
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