Question about Hayward 100,000 BTU Pool Heater H100ID1 - Above Ground

1 Answer

I have a hayward 400d heaterthat is rattling then cutting off...what could cause this?

Posted by Anonymous on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Hayward Master
  • 5,922 Answers

Lack of water flow or bad manual bypass

Posted on Sep 05, 2017


1 Suggested Answer

  • 2 Answers

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

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.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Hayward pool heater rattling

this is caused by an obstruction in the water flow. check for blockages in both the supply and return piping

Aug 12, 2015 | Hayward Pool & Spa

1 Answer

I have a hayward 1.5hp pool pump that overheats and cuts off what is causing this?

motor is overheating the thermo is shutting it off for safety need a new motor or pump sometimes the whole pump is cheaper than fixing the old one

Jun 02, 2014 | Hayward Pool & Spa

1 Answer

Hayward h1001d diverter plate broken - How do you repair?

diverter plate controls water flow check flow from pump

May 22, 2013 | Hayward Pool & Spa

3 Answers

I have a hayward H100ID above ground pool heater. Recently the heater is making a rattling sound and the in and out hoses are bucking or pulsating. The water is still being heated but somehting does not...

Thank you for posting your question here on

The Hayward H100 has a diverter plate welded into the header that helps direct some of the water flowing thru into the heat exchanger to heat the water. If the weld fails the diverter can interfere with that flow and cause overheating or poor flow thru the heater which in turn can lead to the problems you describe.

Remove the inlet side hose once you have blocked the flow of water from the pool and you should see the diverter in the inlet. If you can move it then it is broken and needs to be fixed back in place or the whole heat exchanger needs to be replaced.

If the diverter is not moving then your issue is likely an overall water flow one and the next place to look is the filter. Poor overall system flow may be enough to close the pressure switch telling the heater the pump is on but not enough to keep the water in the exchanger from getting too hot, again causing the symptoms you describe.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at Positive feedback is appreciated once your problem is solved!


Aug 30, 2011 | Hayward 100,000 BTU Pool Heater H100ID1 -...

1 Answer

Hayward heater h1001d1 shakes and rattles after startup

water to slow for the heater or the by pass valve is bad

Jul 28, 2009 | Hayward H Series

1 Answer

My Hayward AG 100,000 btu heater ran well for the last two seasons. This season I hear a rattling type noise, and the hose that feeds the heater shakes at times. Other times the noise and shaking subside....

That plate should not move at all. If it is moving is is damaged. In the past that meant replacing the heat exchanger but I recently had someone tell me they took theirs to a radiator shop that tach welded the plate in place and it works fine now. Either way, the rattle is from water boiling in the unit due to poor flow through the heat excahnger. The plate we are talking about is what controls that flow.

Jul 06, 2009 | Hayward H Series Induced Draft Abg 100,000...

1 Answer

1 year old hayward h1001d pool heater clicking

Actually, the clicking is likely causing the shaking. Inside the manifold of a H100 is a stainless steel diverter plate that send some of the passing water into the heat exchanger and lets the rest past and back to the pool. When it breaks, you will hear a 'clicking' noise at it rattles in the water path. When it breaks, the flow to the heat exchanger is intermittent and you will begin to boil the water, causing the shaking. This situation is dangerous, especially without a pressure relief in the heater or pipe. As long as your water chemistry is sound, Hayward will usually cover this under warranty even if the unit is over a year old. Contact them to get a factory authorized repair rep out at:

May 27, 2009 | Hayward H Series Induced Draft Abg 100,000...

1 Answer

Cutter Problem

the cutter has that bushing attached to act as a tire as it travels across the scan axis, these infrequently wear out and cause the carriage to basically drag the blade behind causing your uneven cut pattern, the cutter must be replaced. If you need direction on how to do so please contact me

Apr 16, 2008 | HP DesignJet 1050c InkJet Printer

Not finding what you are looking for?

Open Questions:

See all Hayward 100,000 BTU Pool Heater H100ID1 - Above Questions

Hayward 100,000 BTU Pool Heater H100ID1  - Above Ground Logo

Related Topics:

197 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hayward Pool & Spa Experts

Jay Finke
Jay Finke

Level 3 Expert

1358 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