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Problem with my H400 IDL natural gas electronic ignition heater

I have a Hayward H400 IDL natural gas electronic ignition heater. My heater is about 5 yeras old and I have used it 5 times. I opened the pool this year and followed the directions to fire up the heater and it didn't work. It would start its cycle and I would hear a click then it would catch and I would feel heat from the vent and then after 3 seconds it shuts off. I had my gas company come out and they thought it was a delivery issue. I wasn't sure why now since it had worked all these years but they changed an old regulator and I recieved a greater gas flow but within the tolerance of gas supply needed to operate the unit. They checked all the limits, gas valves, cleaned the flame sensor, burners, cleaned alll the gas pipes made sure there were no obstructions and no cob webs. In the end the diagnosis was bad module controller or flame sensor or both. What do you think. These parts are expensive and I was told I could repalce them myself. help.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: Hauward H400 heater won't turn on

check pressure switch operation most heaters will not operate without sufficient water flow/pressure. You can use a multimeter to troubleshoot the wiring using the schematic. If its induced draft milivolt ignition verify there is suffiecient gas flow to the unit

Posted on May 26, 2009

  • 15 Answers

SOURCE: Hayward H Series 400,000 BTU Pool Heater Won't Ignite

You can not manually light it. Open the front cover look for the gas nozzles brass looking on a tube. on the right side you will see a wire going to a sensor above the next to last burner take the nozzle out for that burner. 7/16 wrench unsrcew the nozzle and see if it is clogged. use something soft to push it out. Spiders love to lay eggs in these. Spray with WD40 and reassemble should work now

Best of luck

Posted on Jun 23, 2009

Coastsider
  • 331 Answers

SOURCE: finned tubes get too hot all thermostats and controls chech out o

Sounds like you might have an elevation vs gas burn issue. If you are using a unit not designed for the elevation it is installed at, the unit can burn incorrectly causing the problem you are reporting. Hayward as well as other manufacturers make units to operate from sea level up to about 2000-3000 foot and units designed for higher elevation. It has to do with burn rates and proper gas mixture with oxygen. higher elevation has less oxygen and thus need different size gas orifices. It also is important to make sure you are using a Natural Gas unit with Nat Gas and not propane. Propane burns much hotter and requires smaller orifices. This can also cause premature burn out. Check with Hayward to determine your unit qualifications vs location of installation

Posted on Apr 14, 2010

john224
  • 1378 Answers

SOURCE: my plumber needs manual for Hayward #H400 FDP

The P at the end stans for propane...the manual found here is for the H400FD series natural gas or propane.

John

Posted on May 31, 2010

StepehnD
  • 78 Answers

SOURCE: hayward H400 error code bo

This error means "Bypass Operation". On the back of the control module there are some "dip switches". They have an on or off position. Check switch number 2. Make sure it is in the "off" position. The "on" position is for a remote thermostat.

Posted on Jun 29, 2010

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1 Answer

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0. Check the spark ignitor conection to the board
1. Check the water by-pass valve if you have it
2. Check your gas pressure. (5-7"wc for natural gas, 9-13"wc for propane gas)
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I'm trying to start-up a Hayward H400 natural gas heater for my pool. It was brand new last season and worked perfectly. It keeps firing up for a little while (maybe 10 seconds on average) and then shuts...


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