Fired up the pool heater and it is taking forever to heat the spa up. Usually 1 degree per 2 mins, right now running 1 degree per 6 mins. Cleaned the burner assembly and no change. The assembly was relatively clean for 6 years old.
11"wc at the 2nd stage propane regulator when heater off. Heater on 2"wc. That seems to be low.
0"wc at the gas switch inside the unit when off which is good and 2"wc when the heater is lit. I believe the manual says that it should be about 9"wc when heater running.
The fact that it is the same reading of the 2nd stage and the gas switch tells me that if there is an issue, it is at the 2nd stage regulator or with the first stage regulator.
Is 2"wc ok? Should I be testing something else? Thoughts on what the issue could be?