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I have a Jacuzzi Quanta with 12kw heater element, looks to have been made by Ogden Manufacturing. Part number KV-2-0074-M1, 12000W 240V 1phase. My hot tub somehow had a heating element stick on, even with the controls turned off. The filter was not running, so doesn't appear to be a control issue (reed switches) since if either Whirlpool mode or a Heat mode stuck on at the controls, the filter should also be running.. unless something funky with Bridge "B" or Relay #6 (thermal control relay). At this point, thinking relay #1 might have stuck.. the contacts are pretty burnished. I'll be replacing that relay & any others with burnished contacts.

Looks like it cooked the high-temp side 6kv heating element (dual element = 12kv) as that reads infinite when checking the ohms across the high-temp element's wires at the relay. The low-temp element reads around 9.8ohms across its wires, but I also tried measuring between the low-temp element wires to the ground terminal block & it reads something like 70-80ohms..ohms climb up some if I keep the meter on it, but in any case seems to me like it should be reading infinite.. otherwise looks like it's shorted to ground? The hot tub immediately kicked the hot tub heater element breakers & also the house breaker for the tub.

In any case, think I'm in need of a new heating element & these things appear to be scarce & very expensive. I tried contacting Ogden to see if they offer an equivalent heating element and my email to their contact address bounced back. Is there an equivalent from them or another manufacturer I can put in, even if it's slightly less kilowatt? We'd normally kick the breaker in the house panel if we left the tub on high temp setting for too long. Not sure if that was due to the high-side element starting to go or just that it would keep the elements on longer than when set to the low temp setting & got a chance to turn off.. but we'd run on the low temp setting most of the time. From what I can tell on the schematics both heating elements would be on regardless if in high-temp mode or low-temp mode, more a matter of what temperature they're kicked off at (ivia settings at temp pots).