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I have a Superior DR-500CMN direct vent gas fireplace that won't start. I have cleaned the Thermocouple and Thermopile. The pilot light stays on strong and has a clean blue flame. I tested the Thermopile and it was around 545mV, so that seems OK. I have tried to bypass the switch by manually connecting the two wires on the switch and also tried jumping the TH and TP/H terminals with a paper clip, yet the main burner still doesn't turn on. Does anyone have any other ideas before I resort to calling a tech to come out and look at it?

Here is the Pilot Assembly I have

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After testing the Thermocouple and also getting solid readings, I decided it must be a bad gas valve. Since Honeywell doesn't make gas valves anymore I got the closest replacement online that I could find (0820652 Sit 820 Nova Natural Gas valve). It wasn't a direct replacement, I hade to alter the original bracket to make it fit, flip the gas valve and reroute everything to the opposite side but it's working great now.

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  • Are you the same person as Weldon who posted the original question? If so, thanks for coming back to answer your question! Please follow the instructions here to get the accounts merged. If not, please clarify how this answer applies to the original question.
    – FreeMan
    Dec 5, 2023 at 16:49
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    I am the same person, I submitted a request to merge the account as you suggested. Thanks.
    – w1a5r
    Dec 5, 2023 at 18:06

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