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Weil Mclain WTGO-4 has been firing sporadically. It is used, at this time of year, solely for heating the domestic water in the internal tankless heater. The unit is a home heating oil fired one. Recently, usually in the early A.M., my wife says "The burners not lighting", and she was pushing the reset button on the HONEYWELL ignition and it would fire. Lately it won't fire, but if I crack the peep door, it fires. I close the view door, and go back to bed. Today it lit, but went out, and again on tries 3 and 4. FUEL in the tank. Filter is spotless and filter cannister is full but same problem and now it's as though there is no spark. Will not fire at all. Unit is in laundry area and does collect lint, but I've been keeping it clean. Unit came with a 1.25 gph 80* B nozzle. I later installed a 1.00 B nozzle as per technicians reccommendations/practices. My new tech (3 years now) has a .85gph, but I'm not sure of the pattern but he states that he runs it over-pressured. Got me. Okay, where to start? Top flue goes into a masonry chimney. It's bad enough that my clothes washer is down (that's another forum) but when you start messing with my hot water, that's a NO NO. And last I looked the wash drum of a commercial Maytag looked a bit uncomfortable. Just thinking aloud. At least the AC is working! Beckett burner - RWB model Suntec strainer HONEYWELL ignition Unit ddoes not have the auto purge feature of the newer ones. This one is 5+1/2 years old Lastly, this problem is repeating itself for the three years that I've been using my new tech, but it has never been this serious. Always, about 7 - 71/2 months after he tunes her (in November, this year December) it goes through this intermittent firing problem. This time, though it is much worse. Help please!