I am taking care of a pool for a guy who lives out of state. The heater does not seem to work correctly. At first it was because the water bypass was turned off. Now that the water is running thru it turns on but then temp seems to be the same. Turned the pump on yesterday it ran it's normal 6 hours, 10 am -4pm, went back today and temp was the same as when I left yesterday. Is it possible it cooled down that much after the pump stopped running? Outside temp is 86-92 , the pool temp is cooler than the outside air temp. The pool is 15,000-20,000 in a screened in area that does not get alot of direct sun. When it does run there is cool air coming out of the top where the fan blows. I can hear water circulating thru it.
The heater is a Perfectemp model HP-6 not sure how old it is.
I am going back now to switch it to the spa and see if that will heat up since it is a smaller area. If that doesn't work what is next???