I have been struggling with my 2008 Arctic Spa Cub series hot tub.
The heat is intermittent. Sometimes it heats to the desired temperature. Other times is maxes out around 96 degrees. If it is at 101 degrees (as an example), when it dips below 99 degrees, the pump kicks on, but the water doesn't heat.
I changed the filters. I even removed them. It doesn't help. I installed a new pressure switch and heater. It doesn't help. I replaced the spade connector terminals at the pressure switch. It didn't help.
I'm getting 220 VAC at the heater. The heater measures 10 Ohms when disconnected. I can't verify the current because my meter is limited to 10A.
The pressure switch does open/close when there's flow/no-flow. I am getting no error codes on the display.
The display reads the temperature accurately. The pump seems to be working fine...there is no substandard water flow.
If I flip the breaker, wait an hour, and re-start, things work ok for a little while, but eventually the temp drops down to around 95 degrees, and the pump runs constantly.
I ordered a new heater relay and will install it when it arrives tomorrow.
Is there anything I am missing, or something else I can try? If the HL switch was bad, I should get an error code, right?
Any guidance is appreciated!