Light the panel at a very low pressure The panel not lighting is probabably the first pael to get gas and is not having the correct air /fuel ratio to burn. Make sure the igniror is properly positioned. The lit panel can ignite the raw gas expelled by the unlit and create a flash ignition . (explosion) The ceramics a very delicate and I would be reluctantant to advise on clean. You can blow it out with compressed air if available..
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Light the panel at a very low pressure The panel not lighting is probabably the first pael to get gas and is not having the correct air /fuel ratio to burn. Make sure the igniror is properly positioned. The lit panel can ignite the raw gas expelled by the unlit and create a flash ignition . (explosion) The ceramics a very delicate and I would be reluctantant to advise on clean. You can blow it out with compressed air if available..