Question about Pentair Minimax NT Heater

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I shut off the gas to the unit and the power.i

I shut off the gas to the unit and the power for 1 week. i changed the copper heat exchanger. when i tried to fire the unit the fan comes on but the heater doesn't fire. the service light comes on. a service guy said i need the following, flame sensor replaced, thermal fuse replaced, and no voltage to gas valve. the unit was fine prior to replacing the heat exchanger. does this seem correct all these would go out

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No, that does not seem correct. If all you did was replace the heat exchanger, then tried to start it up, how could everything go wrong. Unless there was another issue with the heater. Not too many people change out the exchanger, unless corrosion has caused a leak there What you CAN try to do is reset the heater. To do this, turn off your heater first-at the toggle switch inside the right hand side door, then turn off the circuit breaker to the heater, wait about 5 to 10 minutes, then reverse the order. Circuit breaker then heater, if you have the digital display, you will see flashing codes, this is the computer resetting, then you should see the normal display. Try starting the heater again. If it still will not fire, let me know if you receive an error code. Also, check to see if the temp the heater is reading is close to that of the actual water temp.

Posted on Jul 01, 2009

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1 Answer

My jandy xl 250 pool heater runs great for 5-6 minutes with a blue flame then it turns orange and runs hot ive replaced all 5 burners wire brushed and power-washed the heat exchanger. I tore it all apart...


bad mixture is correct. heater is under firing, lack of oxygen, hence the immense amount of soot or carbon build up underneath heat exchanger. Is heater inside a shed? if so u need 2 vent openings to provide combustion and ventilation air. vent blockage can also cause sooting and over heat conditions. your repair guy lacks alot of knowledge. burners and heat exchangers can be cleaned. i can give you a list of reasons of possible problems that im sure were never mentioned or checked

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1 Answer

Heil epm36f19a1 runs but no heat


Fan relay is stuck among other things. The thermostat turns on the combustion air fan and puts power to the spark unit. If the burner comes on after the temperature in the heat exchanger rises the indoor fan will then come on. After the thermostat comes to temperature the power to the gas valve which shuts off the burner. Then after the heat exchanger cools a bit the indoor fan will stop. That's the sequence of events. look at the switches that control the fans. There is a wiring diagram somewhere on one of the panels that access the unit for service.

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Having problems with metal staining. i was told that i should clean the heat exchanger. can i just take off the front header & flush the tubes with some d-lime. Thanks


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Water turned green was blue this am heater off for 1 week browncolor in water and filter is heater damaged?


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Purex triton powermax 400- gas ignites for a moment and then shuts off - basically cycles on and off for the spa. any idea to the problem?


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1 Answer

Furnace runs about 1 minute, then total shutdown


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