Why we use Reflective Materials for growing hydroponically?
Is it getting enough air around it? Is it vented right? Fire need air to burn. Check the exhaust pipes to see if they are clogged, the vent on the roof is good.
Could you rephrase your question? It sounds like you replaced the pilot light assembly and it works, but you're not getting gas flow to the main burner. Is that correct? Also, you mentioned thermocouple and thermopile in the same question. If you have a thermocouple, yes it could very well have been damaged, that thin copper tube which conducts electricity is fragile, and the connection at the gas valve has to be clean and just tight enough, not too tight or it ruins the connection. If you have a thermocouple aka millivolt generator, then it has two wires, encased in insulation. If you disconnected it from the gas valve, it's possible that it was reconnected backward, swap the red and white wires and try it again. An old millivolt generator which isn't putting out as much voltage as it used to is often the problem. The valve is getting enough power to keep the gas flowing to the pilot, but not enough to open the main gas valve. To test it, you'll need a voltage meter capable of measuring 500 to 750 millivolts. Usually, this will cost about $30. So will most new generators. Your call. Testing is just a matter of keeping the pilot light lit for a minute or so and checking the voltage at the terminals. Before you go through that, check for corrosion or loose connections. With such a low voltage being supplied, even the least bit of resistance can be enough.
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