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