Our normal method of operating our spa is as follows:
Set the pump to only circulate spa water
Turn on the heater
Heat to high temp
turn off heater and start recirculating only pool water
Turn on secondary spa jet pump which only recirculates spa water
If we start our heater, it will fire up and heat our spa up to temperature quickly and without fuss....once. After a few hours, the water will cool, and we will want to start up the heater again. I've tried to restart with it recirculating spa and/or pool water, and it will never relight in the same night. Next day, it fires right up. Basically, I get one instance of heating from the heater per day, so I better choose wisely as to what I want to do with it. Any ideas what could cause this weird quirk to happen?
It's a Platinum II by Teledyne-Laars, which I understand is made by Jandy now, and parts for this heater are fairly hard to come by...It's not long for this world, but I'd like to be able to keep using it until we bite the bullet on replacement.