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Posted

My hottub tripped it's 30 Amp fuses. I replaced my fuses and when I went to start the pump. The circuit board caught fire. I have replaced the board and all damaged wires. But im reluctant to start it up as I don't want this to happen again. I got this used hottub about 6 months and I filled it with water and started it up with no issues to about 15 hours of it heating up  all settings of the pumped worked before the fuses went. When I put in the new fuses and pushed on the jets. The board started to pop and crack and glow red.

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Posted

The relay stuck closed. That caused it to overheat and catch fire.

That does happen frequently, usually on relays that have been in service for a long time. The contacts arc every time they break the connection. Over time, the coating wear thru and then the relay is either prone to sticking or fails with the contacts not conducting.

Your new board should be good for many more years of service, go ahead and use the tub.

  • Like 1
Posted

Post a pic of the wiring diagram. I'm pretty sure that's a heater relay, which won't turn on unless the pump is on, that is burned. 

As @cranbizsaid, it is usually from simple wear. And unlikely to be a pump problem if it's a heater relay.

  • Like 1
Posted

Ok. The 4 "fingers" on the top are heater power circuit. The bottom 2 are everything else. If the burn is behind any of the 3 top right relays beside the 4 fingers it is a heater relay. My money is on the one in the middle, likely labeled "heater".

  • Like 1
  • 3 years later...
Posted

A bit late to the convo but thought I'd add that I had a similar issue to what seems like a near identical board. Bought a used Beachcomber hot tub (500 series - pre 2000) and when turning on power for the first time the pump didn't come on (I'm thinking air block) but heater sure did. Cooked my pressure sensor and everything started smoking before I turned power off. Board seems fine but in testing the relays the one at RL2 HEATER, a AZ2160-1A-15DEF relay, seems to be stuck in the on position. Getting continuity between the two sides of the relay(pics attached). Gonna try to replace the relay with the same model but open to advice. Thanks 

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