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there should not be smoke after the first 1-2 seconds of heat run time, it will puff a couple seconds, not more than 3-4 when cycling on/off or when moving from heat to vent. I vent my heater exhaust to the 'storage' side of my shop and have no issues with carbon monoxide in the big side, unless...

this shows fuel pressure as heat (90psi), then fan(25), then purge(15), then fan and back to heat

are you checking and adjusting the pressure in the 'Fan' mode or 'Heat' mode? you will have 40 psi on fan mode only and about 20 psi with the purge switch engaged in fan mode, there will be no fuel to burner also in fan mode, only return fuel to the tank. to adjust high side pressure, it must...

Yes, turn down fuel psi, its just wasting fuel, sending out the exhaust, you fuel economy will go up and you won’t notice any difference. i am at 3100’ and run about 90 psi did you read his thread? https://www.steelsoldiers.com/threads/its-cold-outside-lets-talk-heaters-h81-h82-h83-etc.132138/

Over pressure, try running 80-90 psi also pull front cover, make sure the flame sensor sees the burn chamber