Question about Hayward 250kbtu Ng Pool Heater - Inground

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H200 heater wont Light

Hayward H200 milivolt heater only lights when jumping the TH terminals on gas valve. Jumping the rest of the parts as repair guide states will not light the heater. Before following the guide I was usually able the get the heater lit by reseating all clip connections on front control parts and tapping on componants. The heater will ALWAYS light when jumping the TH terminals.

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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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