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Well, you did not state which model and year your tub is, but if this is a 2001 or newer tub, you can check the heater relay board. Check for burnt relays or the lack of power to the heater from the heater relay board.
: My hot tub has stopped heating. I have good flow through the silent flow
: 5000 and I removed the filters just to make sure they were not the
: problem. The reset button on top of the heater is not popped up and i
: have tried to push it down but it seems to be fine. The red LED on
: the circuit board in the control box indicates the "htr
: on". I have tried unpugging and woiting several minutes and
: plugging it back in. could the heater have just gone bad? How do I
: verify before spending $300 on a new one?
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.