Hot Springs Grandee- Heat Issues- Slow To Heat

[soleskier]

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.

Symptoms:

• 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.

Sole

[PreservedSwine]

After confirming breaker voltage is solid- replace the heater PCB

[soleskier]

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?

Thanks

Sole

[mitchellpsp]

Is it IQ2020 from Watkins? Yes...easy. Pretty easy to find too. Flip board over to see extent of charring. OR...check out my post on these boards.

[soleskier]

All FIxed!

New Heater relay board. 10 minute install. Done!

thanks for the help