Question about Pentair Minimax NT Heater

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The pressure switch light is illuminated and that is the only light that is on. The pool heater was shut off in the spring and worked well then. We put in a brand new filter just before leaving for home, what could of happened to it as it will not operate now. None of the digits for pool spa are illuminated, looks like it is shut down, somehow.

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Check to be sure that your gas valves are on at the house or tanks and outside and inside the heater. Then be sure to bleed the gas line. If it has sat for a while the gas could have disapated from the line. To do this just shut the gas off outside the heater and open the line by loosening the flex line or the union at the heater. Open the gas untill you smell gas, then shut the gas down again and tighten the fittings up again. Then give it about ten or twenty min. for the gas to clear, open the valves again and see if this helps. Good luck.

Posted on Aug 31, 2010

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1 Answer

The red light on heater won't turn on


This is an indication that the pressure switch is not working. When it completes the circuit thru the pressure switch it send power to the heater. It is the last fail-safe before power goes to the heater.

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If I jump the pressure switch on my Laars Lite pool heater and the pump shuts off, with the high limit switch shut off the heater?


the other safety features will still work as expected. however, by bypassing the pressure switch, the heater will continue to run even if the water system is turned off. since the millivolt system requires no external power to operate, if there is a power outage, the heater will still run causing an EXTREMELY UNSAFE HAZARD. remove the jumper and do without your heater for a week.

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1 Answer

How do I adjust the pressure switch on my hayward h250 heater


The purpose of the pressure switch is to verify the pool pump is operating properly and water pressure is present in the heating chamber. When water pressure is not present, the heater control system is designed to not allow initiation of flame. The pressure switch is preset at the factory for deck level installations. When the heater is located below the level of the spa or pool, the pressure switch may require an adjustment to compensate for the no-flow static head.

CAUTION: The Hayward Pool Heater is essentially a furnace. A trained technician should be consulted to repair it. DO NOT OPERATE the Hayward Pool Heater without a properly functioning and calibrated water pressure switch. The pressure switch adjustment requires both the pool pump and the heater be operational. As a result, extreme caution should be used during this procedure since sources of energy can not be isolated during the procedure.

The following procedure is recommended to calibrate the pressure switch.

1. The water pressure switch is located behind the front service panel. The pressure switch is typically on the left side, above the burners.
2. Be sure the water filter is clean before making the adjustment.
3. With the pump and heater system switch on, carefully turn the pressure switch adjustment dial clockwise, until a click is heard from the gas valve.
4. Turn the adjustment dial counterclockwise 1/4 turn.
5. Turn the pump off and on several times. The heater should shut off immediately when the pump is shut off. If the heater fails to shut down when the pump is off, repeat the steps above until the pressure switch is properly adjusted.
6. If the adjustment process fails to produce proper results the pressure switch should be replaced.

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1 Answer

I have been working to get my heater started since Spring. My pool contractor has been out and cleaned, fixed any issues but now says if I have too high a pressure from my DE filter, the heater will not...


the contractor is correct about having to high pressure in DE filter. it will prevent pressure switch from closing, therefor burners wont fire. However, the pilot issue is a diff problem. you most likely need a new pilot generator

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1 Answer

Hayward h250ed1 heater wont stay lit


Try cleaning your filter if dirty there will not be enough flow to llet heater fire. If filters clean you can try jumping the pressure switch.

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