Pentair Pool Products manufactures and markets products to keep your pool or spa running smoothly. The Pentair product line includes filters, pumps, skimmers and heaters. The MiniMax NT model is a heater designed to keep your pool at a desirable temperature for comfortable swimming. It is wise to contact your dealer if any major problems arise with the heater, but you can usually troubleshoot smaller issues yourself.
Ensure that both the heater and pump are in the "On" position and any electrical connections that lead to the heater are secure if the heat won't come on when prompted. Also, inspect the pump for leaks and clean out the filter if it is dirty.
Clean out the filter of any debris, as well as the pump strainer if the heater is cycling on and off quickly. Have the wiring to the heater repaired by a technician if it appears damaged.
Change the fuse or reset the circuit breaker if the heater will not turn on at all.
Remove any obstructions in the heater's venting system to maintain smooth operation of the unit.