Hello, I went on a no heat call for a customer. Hot Dawg HD-75 in a garage installed 15- 18 years ago. The heater goes thru the proper ignition sequence, hot surface igniter lights up, gas valve opens, gas comes into tubes, but nothing lights. I have 6.5 in. wc at inlet tap and 3.5 at outlet tap, right in the listed specs. I can get the burner to light if I hold a lighter at the end of the burner tube that has the igniter, it will run fine but then won't re-light. I took the manifold apart and checked the orifices for obstructions, nothing there. Everything seems to test fine but I HAVE TO BE MISSING SOMETHING. Any one have any suggestions. I'm stumped. Thanks in advance, Bill
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