Question about Hayward H Series Millivolt Heater
Went through all troubleshooting
Posted by Anonymous on
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Posted on Jan 02, 2017
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
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
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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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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