Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

2 Answers

Outlet water gets so hot it ballooned the PVC pipe like an anuresum. Lights and shuts down, assuming that is a limit switch working properly. Filters cleaned last month/water pressure seems adequate.

Hayward h400

Posted by on

  • h_hogey Jun 01, 2015

    Years later but might help someone else. There should be a cap you can remove. It might be bolted on, or could be a 2" cap. Remove it. There will be a spring and a diaphragm or it will have a thermostat like in a car heater hose. This part controls a bypass to reduce output temperature. Yours sounds broken.

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Hayward Master
  • 1,631 Answers

Correction Bill...
A thermocouple or thermopile or pilot generator (these are all the same) does not monitor 'Temperature' of the heater and does not communicate with the heater to tell it how hot it got the water!
The purpose of the Thermopile is to sense a pilot flame, generate enough electricity (Milivolts) to operate the functions of the gas valve, thermostat, pressure switch and misc hi - limits.
If not enough electricity is generated, heater won't function. If no flame to consume the pilot fuel, which you manually have to hold down until it gets hot enough, the pilot valve will automatically stay open, and you can let go of manual button. Pilot remains lit = communicating to heaters gas valve: "There's a flame consuming the gas, it's okay to keep it open". Now you turn the manual gas valve knob from Pilot to On. Again communication from thermopile to gas valve, and gas valve will confirm: "My valve is now turned to ON, Hey thermopile is there still a flame? Yep! Okay then, since there still a flame at pilot burner to consume the main burner fuel, I'm going to open it! Is that okay? Yep! Okay here goes".
Heater will then fire up, if all systems go.
Now the heater is set to 100° the THERMOSTAT, will monitor the temperature and will tell the heater to turn off when it has been reached. Actually realistically, the thermostat turns the heater off by opening its circuit when desired temp has been met.

Now...
If water flow is drastically reduced or dramatically restricted, the outlet water flow will be EXCESSIVELY overheated! This will melt outlet pipes. The Unitherm governor may have failed. If there is a bypass valve installed it may have been left open, which in turn is diminishing proper water flow. = problem.
Check for anything that is restricting water flow.
Note*** water pressure that seems adequate - is not good diagnostics and it does not =, or is not the same as, good water flow.
Good Luck

Posted on Jun 03, 2015

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 372 Answers

Your thermopile that tells the heater how hot the water is has failed. It should kill the heat at a temperature of 104f. This also indicates that the limits are not doing their job, as they should be killing the heat at 135f (low limit) or 150f (high limit). Schedule 40 pvc is rated at about 140f.
This many failures at once is rare, and typically indicates that the heater has been rigged. Get a tech out to fix it correctly. You are literally playing with fire.

Posted on Nov 30, 2013

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

  • 10 Answers

SOURCE: I'm trying to start-up a Hayward H400 natural gas

if means ignition failure check that gas is on, check for fauilty igniter wiring or connections, inspect gas valve wiring measure voltage across gas valve during trial to ignition if 24 volt replace gas valve if no 24 volt replace control module

Posted on May 19, 2009

  • 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

john224
  • 1378 Answers

SOURCE: heater runs but there is load banging and knocking

Poor flow, try cleaning the filter. If it is a cartridge, try a brand new element. Next would be to inspect the bypass in the header to ensure it is sound.

Posted on Jun 12, 2009

  • 990 Answers

SOURCE: Hayward H400 runs for 2 minutes and turn off, flames out chimney

Soot on your heat exchanger would explain this. Or leaves or rat nests would do the same thing. You can clean these yourself or get a repairman to do this for you. Just be sure if you have soot on the exchanger use a stiff bristel brush but not a wire brush. The soot as you free it up will be pouder and can explode in a fashion. Be careful and good luck.

Posted on Dec 18, 2009

thepool
  • 78 Answers

SOURCE: Hayward H400 Pool heater will not stay lit

"IF" - Hayward Pool Heater Fails to Ignite: the most common reason for this problem is insufficient gas supply. The Hayward heater LED display will show a diagnostic fault code of "IF" which stands for Ignition Failure. Undetected gas pressure problems if not investigated properly may result in unnecessary replacement and servicing of your Hayward Pool Heater.

Posted on Apr 23, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What causes a Bradford White Gas Hot water heater to leak at the base of the vent fan?


Hi,

Here are some general things to check:

1. Is the vent piping correctly sized?

2. Is the vent piping run too long? There are length limits depending on the heater for both vertical and horizontal runs.

3. Is there sufficient combustion air available? A very tight dwelling can cause a lack of adequate air supply for the combustion process.

4. Does the vent pipe run through a cold or otherwise unconditioned space on its way to the outside? The vent may need to be insulated (high temperature insulation only)

5. Is the vent fan working properly and stay on long enough?

6. Is the gas supply pressure ok and is the burner working properly?

Aug 12, 2015 | Refrigerators

1 Answer

My Carrier AC is leaking from the inside connection to where the white PVC tubing connects to. The padding inside is soaked and when I press it, it is filled with water. It continuosly drips down water...


If this unit is new more than likely the condesate drain line does not have a deep U shaped "trap"in it. This allows the negative air pressure inside the unit to draw air up thru the drain line holding the water inside the cabinet until the fan shuts off, then the water can drop out of the unit everywhere.

If the system has been in foe some time and has the proper "trap" the drain line could be plugged any where there is a turn in the pipe. It is a messy clean out but it can be done by cutting the straight PVC pipe, right after the screw in fitting and the 90. This will allow you to unscrew the fitting at the unit and clean it out. Sometime there is a gel like clog that grows at this point. Then you can take a wire or compressed air to clean out the rest of the line to the outlet. Next pour hot water thru the PVC and see how it comes out the end. Worst case you will need to pour a solution of hot water and white vinegar to remove any build up.

Jul 29, 2011 | Carrier 38CKC042 Air Conditioner

1 Answer

My fisher and paykel ecosmart gwl15 won't do a hot wash. although the hot wash is selected, the water remains cold. there are no error lights or beeps. Help!


There are several possible causes. To track down the problem, first shut off the water supply valve feeding the washing machine, then remove the hot water hose from the machine and direct it into a bucket. Turn on the water supply valve. Does water come out? Is it hot? If you only get cold water, then you need to insulate the pipe between the water heater and the supply valve so you get hot water faster (assuming the water heater is working!)

If you have a supply of hot water, then check the inlet screen where the hose connects to the washing machine. Perhaps it is clogged with lime or sediment. If it is clear, then you have a fault in the hot water solenoid valve or water temperature selector switch.

Dec 05, 2010 | Fisher Paykel EcoSmart GWL15

1 Answer

My washer yesterday went through wash cycle just fine with warm water. Rinse cycle a few drops drip down and you hear a slight buzz but will not start flowing cold water.


Im assuming you have 2 water valves, A hot water valve and a Cold water valve. I suspect the inline filters are blocked. Switch the water tap/s off and unscrew the pipes off the machine side. Inside the valve entrance, there should be a sieve. using long nose pliers, pull both out and clean properly. Reinstall in same orser. Test now.

Aug 20, 2010 | Kenmore Washing Machines

1 Answer

MY GE PRESSURE RELIEF VALVE HAS JUST STARTED LEAKING. WHAT SHOULD I DO ? GE SMART WATER HEATER GELN0705CO3984


Hello,
You can buy a replacement relief valve at any hardware or home improvement store. It's real name is a T&P valve or temperature and pressure relief valve. It always has a 3/4" inlet and outlet. It is a very easy procedure to replace. You will need a bucket, teflon pipe thread tape, and a 3/4" x 6" black iron or galvanized pipe nipple. To start the valve replacement, turn off the shuttoff valve on the cold water line. Then open the handle on the relief valve and drain water into the bucket, that is, unless you have a pvc pipe coming off of it into a drain floor, then just drain it without the bucket. Be careful, the water is hot! When the water level gets below the relief valve, it will stop draining. Then remove the pvc pipe, if applicable, and thread in the 6" pipe nipple to use as a leverage tool to remove the valve from the water tank. Turn it counter clockwise to remove. Then put teflon tape on the new valve, going from left to right with the valve threads facing downward. Wrap about 3-4 layers all around the threads. Then twist the new valve into the water tank clockwise and using the pipe nipple tighten by hand until very snug and outlet is facing downward, as before. Remove the pipe nipple and install pvc pipe, if applicable. Leave valve handle open and turn on the cold water until the valve starts spitting, then close the relief valve and let it fill up the tank. If you did it correctly, you are now finished! Good luck!
Douglas

Jun 14, 2010 | Water Heaters

1 Answer

How do I install a second hand waher/dryer with limited piping?


1 yes all standard.2 Yes you can get a Y piece. 3 no you will only use water from cold. But you can solve that by going to a good hardware store or B.Q and gettein a self cutting tap for washing machines. You can fit this in just minutes, and do not even need to turn off the water supply. just make sure there is a clean straight piece of pipe to fit it to. 4 yes fit waste pipe to u bend under sink.

Feb 04, 2010 | Washing Machines

1 Answer

My 1042 Power Humidifier has water under the PVC pipe leading from the unit into the drain. Does that mean the unit itself is leaking water?


Hi, if the unit is leaking and it looks as though it is coming from the PVC pipe, more then likely its leaking at the unit its self where the pipe connects. Water will run down the pipe and drip down line. Dry it off and put your hand around where the PVC pipe screws into unit. Unless the pipe is cracked, this is where the leak is. If the fitting is a male or female threaded PVC fitting and a piece of PVC pipe that goes to the drain, you can repair this very easy. Just cut the pipe near the fitting with a hacksaw. Unscrew the fitting that goes to unit. Go to a hardware store like Home Depot, take the old fitting with you and buy a replacement. Buy a coupling, a small can of clear PVC glue and a small can or tube of pipe dope to put on the fitting threads. Screw the fitting in first and make sure it has pipe dope on it, get it tight with pliers. Take the pipe and coupling and glue it on the pipe. Put glue on the other end and slide it in the fitting that was where it was leaking before. Hold it in place for a few seconds. Once you put the glue on, be ready to put it together as it drys super fast and you cant take it apart once it sets. Very easy to repair and the parts cost pennys. Keep me posted. You can do this and will learn about plumbing! Good Luck.
Shastalaker7

Jan 24, 2010 | General Filters 1042-LH Humidifier

2 Answers

Smart drive washing machine not filling properly?


sounds like you do have a solenoid problem undo hoses from back of machine check the filters are not blocked also check at the tap end to see if filter are cleare if all filters are clear most likely you will have to replace you inlet valves assuming there is no problem with pcb board.

Mar 29, 2009 | Fisher and Paykel GWL11 Top Load Washer

1 Answer

Question before purchase (existing pond)


You don't need a bulkhead if your liner is EPDM. You can use a boot that is attached with adhesive that will seal you pvc piping. I don' t see a problem with dirty water going thru the pump before the filters. for some diagrams of settling tank installations see:
http://www.koipondfiltering.com/koi_pond_filters_diagrams_intermediate.html
moz-screenshot.jpgd7e617f.jpg

Jan 24, 2009 | Tetra 16361 Vacuum Bottom Drain Portable

1 Answer

Rheem small 6 gallon water heater vibration/noise


If the water heater is working fine than I would not worry about the function of the water heater. What the problem may be is that some of your WATER LINES HAVE MOVED, AS THEY WERE NOT SECURED PROPERLY. The sound you may have heard was the Copper or PVC(Plastic) lines just getting back comfortable. I Suggest checking that your water lines are secured about every 3 or 4 feet with the proper ancjhor....Metal for metal pipe, copper for copper pipe, etc. Sometime as in my house, pipes are run through a hole drilled through a stud or a piece of wood, usually when hot water is run through this pipe. You can here an expansion of the water line interacting with the pipe expanding, if the hole in the wood was not drilled big enough......Experience of remodeling a very old house.......Joe

Dec 31, 2008 | Rheem 81VP6S/430126 Water Heater

Not finding what you are looking for?
Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1 Logo

156 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hayward Pool & Spa Experts

Jay Finke
Jay Finke

Level 3 Expert

1343 Answers

Bill Jordan

Level 2 Expert

372 Answers

john h

Level 3 Expert

12650 Answers

Are you a Hayward Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...