Question about Hayward Pool Products Hayward 400k Ng H Series Spa & Pool 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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Posted on Jan 02, 2017
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
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
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
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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