Help: wall gas furnace won't start

Replaced the old thermostat and the flame still does not start. Checked the thermopile and the voltage was more than 500 mv when the pilot was on. Only other possibility: the gas valve was bad? Should the pilot be always on? Or the thermostat controls the on and off of the pilot? 

Previous owner just installed a brand new Williams Gas Furnace (model 2509822) a few months ago (the tenant smelled gas and PG&E said that it was the old furnace problem. So, a new furnace was installed right before we purchased it). 

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Pilot should be always on. Thermostat controls the gas valve via -pssci- 给 pssci 发送悄悄话 pssci 的博客首页 (0 bytes) () 12/18/2017 postreply 10:21:16

回复 -pssci- 给 pssci 发送悄悄话 pssci 的博客首页 (195 bytes) () 12/18/2017 postreply 10:54:59

Thanks for your help -missiondad- 给 missiondad 发送悄悄话 (186 bytes) () 12/18/2017 postreply 13:44:25

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