Question about Hayward H Series Millivolt Heater

1 Answer

Heater wont fire without jumping th terminals

Went through all troubleshooting

Posted by Anonymous on

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  • Hayward Master
  • 4,262 Answers

Something open in safety circuit try pressure switch or copper line

Posted on Mar 19, 2016

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Posted on Jan 02, 2017

jgwhomeequip
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SOURCE: pilot did not stay lit

Your problem is the pilot generator where the flame is by the burners. This needs to be repalced. That is what is causing the pilot to go out and not start. It is a flame sensor and also tells the gas valve when to release more or less gas.

Posted on May 28, 2009

  • 139 Answers

SOURCE: Hayward Comfortzone pool heater pilot will stay

check for continuity at all control and safety components,i.e. press switch,high limits,thermostat,on/off switch and flame roll out switch

Posted on Jun 21, 2009

  • 760 Answers

SOURCE: Hayward H-Series 200k BTU Millivolt Heater -

You didn't say what terminals you jumped, but I assume it's the flow switch, or it could be the thermostat. The flow switch is located on the piping inside the heater. This flow switch is very important because if you didn't have water flowing through the heater it would oveheat. These do go bad or sometimes just get stuck depending on what type they are. If it's the thermostat, mounted on the front pane you're jumping, then either it or it's expansion bulb is faulty. GOOD LUCK Who needs a heater in JULY?

Posted on Jul 03, 2010

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  • 1 Answer

SOURCE: H200 heater wont Light

I have the same heater and have been struggling with it since we purchased our house 6 years ago. I am very familiar with the "tapping" method and just this year learned that I could jump the TH connections to consistently get it to light. Finally that too became unreliable as the heater would shut off shortly after I jumped it. I used a voltmeter to test the millivoltage coming from the pilot generator (assembly) and found that it was only around 300mv, whereas supposedly 500mv is required to open the gas valve. Before investing $70-$100 on a replacement pilot assembly I decided to take it apart and see if it needed cleaning. There was a bit of buildup on the thermocouple that I removed with 150 grit sandpaper. I re-installed the pilot assembly, lit it, and retested the mv. I was disappointed to see that the millivoltage was still only around 300, but as I watched it began to rise until it eventually reached 500. I then turned the thermostat on and adjusted it until it was higher than the temp of water and the heater instantly turned on. So far so good....

Posted on Sep 13, 2010

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1 Answer

Jump th terminals


???

What do you mean jump the terminals?

Not a good idea to ever jump anything, unless your are only troubleshooting!!!!

Especially on a natural gas fired heater! : -o

Jul 12, 2014 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Raypak problem, Pilot is lit, can jump TH to TH to lite, goes out when jumper is removed.


check how many millivolts the pilot is generating. if pilot stay lit and burners wont fire u have a problem with one of the safties, lose wire connection, tstat control

May 28, 2013 | Raypak Pool & Spa

2 Answers

Hayward H 300 series pool heater for an inground pool. Pilot light is lit. Filter is clean. If I jump the terminals the heater will go on. If not the heater will not start.


I have an H300 Millivolt Hayward heater. It will start and run for about 1 minute then shuts off along with the pilot going out. I've tried cleaning all the terminals and running all new wiring but same result. I've also jumped out the TH to TH terminals leaving the jumper in place and it still shuts down after 1 minute. Any idea what that could be ?

Apr 24, 2011 | Hayward H-series Electronic Gas Pool...

1 Answer

Cozy heater will not fire, replaced powerpile but gas valve will not open Jumped tstat also


pull stat wires off of valve and put a jumper wire across the 2 TH terminals on the valve, if it comes on could be the stat wire run a peice of stat wire from unit to stat to test.

Oct 22, 2010 | Cozy (W352E) Heater

1 Answer

Hayward H-Series 200k BTU Millivolt Heater - Natural Gas burners will not ignite. Jumping th terminals /burners will ignite


If the (th) terminals means the thermostat terminals then you have a bad thermostat and it needs to be replaced.

Jul 03, 2010 | Heating & Cooling

1 Answer

H200 heater wont Light


I have the same heater and have been struggling with it since we purchased our house 6 years ago. I am very familiar with the "tapping" method and just this year learned that I could jump the TH connections to consistently get it to light. Finally that too became unreliable as the heater would shut off shortly after I jumped it. I used a voltmeter to test the millivoltage coming from the pilot generator (assembly) and found that it was only around 300mv, whereas supposedly 500mv is required to open the gas valve. Before investing $70-$100 on a replacement pilot assembly I decided to take it apart and see if it needed cleaning. There was a bit of buildup on the thermocouple that I removed with 150 grit sandpaper. I re-installed the pilot assembly, lit it, and retested the mv. I was disappointed to see that the millivoltage was still only around 300, but as I watched it began to rise until it eventually reached 500. I then turned the thermostat on and adjusted it until it was higher than the temp of water and the heater instantly turned on. So far so good....

Jun 07, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

3 Answers

Pilot is lit but the heater won't fire up


A few things dictate when the main burner turns on. One is a thermocouple not getting hot enough, the other is a bad thermostat ot thermostat wire, and another is the gas valve. First look at the gas valve located on the heater and make sure it is in the On position and not in the Pilot position. Remove your thermostat and jump the two wires together. The heater should light. If not, go back to the gas valve and find the wires up to the thermostat, the should be attached to terminals marked TH and MV or something similar. Jump the terminals. The heater should start. If not, you may need to replace the thermocouple.

Sep 04, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

I have a minimax 250 i can light the pilot but the main burner will not light. i jump the th to th/pp and the pilot goes out.


are you sure your jumping th and th/pp? the labeling on valve is a little deceptive.should use 1st and 3rd terminal on gas valve. if your using correct terminals try same thing with thermostat wires disconnected from gas valve. this will isolate valve from all controls and safties.if it fires valve is good and need to look in thermostat loop for problems. hope this helps

Jul 18, 2009 | Pentair 250k Minimax Ch Ng Mv Heater

2 Answers

Hayward Comfortzone pool heater pilot will stay lit but main burner will not fire. If the TH terminals are jumpered it will, but it won't stay on.


Have you tried jumping the pressure switch, as well as the on/off switch. sounds like something in the safety circuit is open

Jun 10, 2009 | Hayward Comfort Zone Electric Spa Heater...

1 Answer

Pilot did not stay lit,replace gas valve , pilot stays lit,but now it won't fire up. Jumped the TH terminals and it shut off the pilot light.thermostat is set highier than the water temp.Jump all ths...


Your problem is the pilot generator where the flame is by the burners. This needs to be repalced. That is what is causing the pilot to go out and not start. It is a flame sensor and also tells the gas valve when to release more or less gas.

May 28, 2009 | Hayward H Series Pool & Spa Heater 400k...

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