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Hot Springs Grandee- Heat Issues- Slow To Heat


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I am chasing an issue with my 2003 Hot Springs Grandee. The hot tub is only heating to 90-94 and will occassionally reach 98.


  • Heat will only increase with Jets on
  • 94 degrees avg temp when thermostat set at 100
  • Took 3 days to come up to 90 degrees after refill
  • all pumps and Ozone seem to be fine and running with no issue
  • Running without fitlers installed- same result- low heat
  • Bubbles are coming from bottom drain when main pumps off
  • When I lower/raise thermostat I can hear and see heater LED come on and off
  • I have turned off both mains 20 and 30 AMP to reset plus main on fuse box for 30 mins

Remediation steps to date:

  • cleaned all filters in proper way
  • Replaced both thermistors first- no change
  • Replaced heater - no change

Any ideas are appreciated.

Thanks in advance.


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Thanks for the reply. I am sure you are correct.

I inspected the heater relay board and the black wire that goes to main board was crusty and black. The wire was all melted on relay board side; i cleaned it up but still no heat beyond 93-4.

Are those boards easy to replace?



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