Swimming Pool Blog
by Mark Garcia March 04, 2015
Pentair pool heaters come from the legacy of the Purex-Triton Minimax heater, when Pentair purchased the Purex company. In 2004, Pentair acquired the Sta-Rite company and it's Max-E-Therm heater technology. The Pentair MasterTemp pool heater adopted the sealed combustion chamber with controlled exhaust design.
The MiniMax pool heater design is no longer being made by Pentair, but parts will continue to be manufactured for years to come, so fear not if you have a Pentair Minimax, which shares a common gas pool heater design with other brands like Hayward and Raypak.
Today's post is specifically about the not-so-new style of pool heater design, used in the Pentair MasterTemp and Sta-Rite Max-E-Therm heaters.
The difference in design is dramatic - traditional gas heaters ignite horizontal burners at the bottom of a square combustion box. The air space above the burners heats up, which heats the copper finned tubes laying on the top of the combustion box. The water circulating through the copper heat exchanger tubes absorbs the heat, and exits the heater a few degrees warmer than when it entered.
By contrast, the Sta-Rite design, now adopted by Pentair, has stacks of circular heat exchanger tubes, surrounding a combustion cylinder. Gas and air are mixed and ignite in the cylinder, which warms the tubes that are wrapped around the central burner chamber. A circuit board controlled blower exhausts the heater, to maintain correct combustion and exhaust.
Troubleshooting the stacked exchanger type of heater is not much different than other electronic or digital pool heaters. The controls and circuit boards for the Max-E-Temp and the MasterTemp are fairly identical. Even the new MasterTemp aboveground pool heater has the same design, and the same troubleshooting procedure. The error codes below can get you started with understanding what your heater is trying to tell you. Below that is the Pentair Matertemp Troubleshooting Guide.
|PENTAIR MASTERTEMP ERROR CODES|
|AGS||AUTOMATIC GAS SHUTOFF|
|HLS||HIGH LIMIT SWITCH|
|AFS||AIR FLOW SWITCH|
|SFS||STACK FLUE SENSOR|
|E02||HIGH LIMIT SENSOR|
|E03||THERMAL FUSE ERROR|
|E05||STACK FLUE SENSOR|
Pentair MasterTemp and Sta-Rite Max E Temp pool heater parts < Just in case, you know?
Thanks for Reading!