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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a significant delay in responses. Please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.
The valve could be bad on the fireplace or the switch could be bad, can you get at the valve.
OK get at the valve and jumper the TH and TP terminals together with a wire or paperclip does the unit light up?
OK then it is either the thermopile or the valve is bad. The thermopile has to generate about 500 millivolts or the valve will not open you can test that will a meter to see or change it out. If that does not solve it replace the valve.
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Test across the White and REd wires to the valve for at least 350+ millivolts.