I pulled the insert out today to clean everything and noticed that the limit switch only had one wire connected to the gas valve. Looking at the electrical diagram, one wire should go to the TH terminal and the other should go to the TH/TP terminal on the valve. If I wire it this way, the burner fires and is no longer controlled by the wall switch. Leaving the wire off, I can control the main burner with the wall switch. The limit switch is closed as I believe it should be. Any ideas? Attachment depicts how it is wired.
![[Hearth.com] Superior Gas Fireplace GHC 5500 Natural Gas](https://www.hearth.com/talk/attachments/screenshot-2024-10-01-161149-webp.330304/ "[Hearth.com] Superior Gas Fireplace GHC 5500 Natural Gas")
Superior Gas Fireplace GHC 5500 Natural Gas
- Thread starter ZGuy
- Start date
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This doesn't make sense. You have a bad switch, a short, or tp lead on wrong terminal. Some older fireplaces came with one wire from the valve to the limit switch with the other side of the switch grounded to the fireplace.
Can you send a picture of what you did? That diagram from fire parts may be wrong for your unit. It sounds like something is shorted. It was probably designed to be like how you found it.