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

1 Answer

Hayward spa heater about 5 years old, when we turned it on for the first time in probably a year as soon as the water heater came on it started making a loud clanging sound

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Hayward Master
  • 1,378 Answers

Thank you for posting your question here on Fixya.com.


For starters you will need to proceed carefully...the noise you hear is water beginning to boil within the heat exchanger. The pressure that results can cause the unit to rupture or worse, blow. DO NOT ALLOW THE HEATER TO OPERATE IN THIS CONDITION FOR MORE THAN A MOMENT OR TWO as you attempt to repair it.

Water boils in a heater due to low flow, allowing the water to get too hot as it passes thru, or a faulty part or parts within the unit. We'll start with parts:

The bypass valve inside the header may be the issue if it is stuck closed. You will also want to inspect the thermostatic control valve in the header (if one is present) and inspect the overall condition of the heat exchanger. It is likely aggressive water has damaged some or all of these parts causing the banging noise you hear.

If the heater checks out then flow is the likely cause. It is possible there is an issue with the pump and/or filter not getting enough flow thru the heater. Check the overall system flow. If it is reduced too low the water inside the heater gets too hot and begins to boil causing the noise you here. Speeding the flow back up will eliminate the issue. Check all the trap baskets and the filter for debris and clean up what you find; backwash a sand filter or clean a cartridge or DE unit. If your pressure gauge is broke replace it and check system pressure. If it is low again that is a sign of a flow problem. If flow is low and all these items check out open up the pump and inspect the impeller for clogged vanes or a blocked inlet eye.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

Posted on Mar 14, 2011

1 Suggested Answer

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.
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have Hayward H400IDL2 heater 6 years old. I recently had #1 and #2 1.5 amp fuses blow. I replaced them and then the #4 2.5 amp blew so I replaced it. When I press the mode button to spa the heater


Hi, this is John the Hayward tech. If you are now seeing the #4 fuse go that is on the low voltage side. I would guess the main circuit board. I left a manual on your other post.

Aug 24, 2014 | Hayward Pool & Spa

1 Answer

Hi I hay a Hayward H400 pool heater. It is 2


This is a water flow problem and will be the by-pass assembly in the water manifold. Or their may be an external by-pass wich will be a valve bridging the inlet and outlet pipes for the water. This valve if you have it should be 80-90% closed to force water through heater. Before you do anything be sure to check to be sure the filter and baskets are clean. Often this is the problem.

Apr 25, 2010 | Pool & Spa

1 Answer

I have a Hayward pool heater. It's about 5 years


would not suggest trying to manually light,its an electronic ign model so you may damage some wires with an open flame.try powering off then turning back on and see if display retuns to normal

Jun 19, 2009 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Have pilot light lit but unit willnot come on hayward h350 heater


check millivolt output,if it is in normal range(400-600)check for continuity on pressure switch,flame rollout and high limits.

Jun 06, 2009 | Hayward H Series Pool & Spa Heater...

1 Answer

Hayward 150 Pool Heater- cannot get lit


Your pilot head is probably clogged with spiders. Disassemble and clean it out and it should start working.

Jun 03, 2009 | Hayward 150k Lp H Series Spa & Pool Heater...

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: http://www.haywardnet.com/locator/

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

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

164 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hayward Pool & Spa Experts

Jay Finke
Jay Finke

Level 3 Expert

1338 Answers

Bill Jordan

Level 2 Expert

372 Answers

john h

Level 3 Expert

12104 Answers

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

Answer questions

Manuals & User Guides

Loading...