Pentair master temp 400 won’t light.

Aug 1, 2016
57
Montgomery tx
Unit is four years old and the problem is intermittent. Sometimes it lights and sometimes not. I have removed the lid and no codes. Blower comes on you hear igniter and you smell gas and No fire. Then I take the front cover off and try again and it lights. I’m trying this morning with no luck. Please help if you have had this problem. Thanks.
 
From personal experience I've had it working with a 3/4" line but after a couple years it needed more and upgraded to 1 1/2". Don't know if it was age or using more gas in other parts of the house.
Just a thought though.
 
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