hayward h200ed2 wont ignite

Did you pay your gas bill? JK

Spiders and other pests like to hide in heaters and can easily clog up the system. I would shut off the gas, pull it apart as best you can and get a shop vac or air compressor and clean out everything you can. The other issue could be a thermocoupler going bad and since you don't say what model it is there could be other issues associated with electronics or circuit boards.
 
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