![]() If you have sand or DE filters make sure you are backwashing the filter every two to three weeks or more often if your pressure gauge indicates a dirty filter medium. Clean or backwash your filter system to ensure there is no blockage or slowdown of flow through the filters. The second place to check your flow would be through your filters. Hayward -40-70 GPM Check your pool filters to ensure proper flow Recommended swimming pool heater flow rates If it is lower your heater may still work intermittently but as the water is allowed to stay in the heater for a longer period of time than recommended it may trip the over temperature limit and shut down. If you have a variable speed pump ensure your flow rate is set to 40 GPM minimum. Pentair brand heaters require a minimum flow rate of 40 gallons per minute to function properly with 45 GPM recommended. Check for proper swimming pool water flow.Īnytime a heater issue is discovered, the first thing to check is the water flow. Something as simple as low flow or a dirty sensor is enough to prevent the heater from operating. There are many safety interlocks that will prevent the heater from working if they sense anything other than their pre-programmed conditions. This whole process is controlled by a control circuit board located behind the user-controlled buttons. It then is regulated via a thermal regulator to control how long it remains in the heat exchanger before exiting via the lower 2” PVC pipe back to the swimming pool. Water is drawn through the heat exchanger through the top 2” PVC pipe going into the heater. A sealed heat exchanger surrounds the flame holder and discharges gases out of the flue stack or exhaust. The heater has a blower that pulls air and gas into the burner flame holder. To control the water temperature a manifold is designed to open up to let water exit back to the swimming pool once it is at its desired temperature. It uses a heat exchanger that is warmed similarly to a tankless water heater to warm the water. How does a Pentair Mastertemp Swimming Pool Heater work?Ī Pentair Mastertemp heater is actually a very simple appliance that becomes more complicated due to all of the interlock protection. How to bypass sensors to test functionality.Pentair Mastertemp Manifold Replacement. ![]() Errors on the heater control circuit board.Reset the swimming pool main power supply.Recommended Salt Cell Cleaning interval.Recommended pool Cartridge filter cleaning interval.Check your pool filters to ensure proper flow.Recommended swimming pool heater flow rates.While this guide is specific to many of the components found on Pentair Mastertemp heaters, most heater brands such as Hayward, Jandy and more use similar components. If your Pentair Mastertemp pool or spa heater has stopped working or is just not functioning as it has in the past, this guide is designed to help you troubleshoot, diagnose, and fix the issue.
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