I have a 435 gallon Bullfrog spa with two 2-speed jet pumps. The water temperature keeps rising to 107 degrees, even though the thermostat is set at 98. (Daytime temps have been < 70.)
After some investigation, I discovered that the heater is not turning on at all. However, during the filter cycle, the outer casing of pump #1 gets as hot as 130 degrees, and the temperature at the wet end is 107.
This pump is supposed to have a thermal shutoff, but to my knowledge has never done so. I have three questions that I need a little help with:
(1) Is 130 a typical operating temperature for these pumps?
(2) If not, how concerned should I be?
(3) What could cause the pump to overheat?
The pump is a Vico Ultra Jet with these specs:
230 volts, 60 Hz, single phase
8.8/3.4 amps (high/low speed - filter cycle runs at low speed)
3450/1725 RPM (high/low speed)
Any thoughts or advice would be appreciated.