It is good to hear back from you. I am sorry that you are having a service issue. Most of the time those symptoms are caused by a dirty pool filter or a valve in the wrong position causing not enough flow to go through the heater. Since you say that you have the flow it might be the flow switch that needs adjusted or if it is very cold out you might see that. If that isn't the problem then it might be a freon issue. I suggest calling the factory at 800 447 9667 and talking to a technician and they will walk you through all the possibilities. Then if they can't trouble shoot it on the phone you will need to get a heating and air conditioning contractor to look at it. I have very few service issues with that brand so I am sure it is something simple. Please keep me advised as to what you found so I am in the loop and any issues.