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Your pilot flame should be blue with a small yellow tip, and it should cover the thermocouple (a small rod in front of the pilot light). If the flame is too small and doesn't cover the thermocouple, it may be adjusted too low, or you have low gas pressure or you have a leak in your gas line coming in to the heater. If the flame looks like a lazy yellow flame, you are probably not getting enough air to the flame. Check that your air openings around the pilot are not clogged up. If the flame looks like a waving blue flame then you probably have excessive draft at the pilot. If the pilot flame looks good and covers the thermocouple, then the thermocouple might be bad. Best of luck. I hope I have helped.
haven't had much to do with this type of heater but a yello9w falme is usually reducing the oxygen from the gas by the the air mixer on some flame effect fires they cover air holes on burner to get the flames yellow the only problem is they can carbon up from this in a heater you don't look into flames this may be ok but i would check the burner air mixture hole if has one but that smost likely the reason for yellow flame not blue so its probably no problem carbon in heat exchanger will make heat transfer a bit slower so probably best to try and fix
It can either be your pilot orifice is dirty and not sufficiently heating the thermocouple or your thermocouple is defective and needs to be replaced. Is your pilot flame yellow or blue? It should be a strong blue flame impinging directly on the thermocouple. If it's not, shut it down, take a can of compressed air and blow out the dust, spider web or whatever is inside the pilot assembly where the pilot flame is. Then try relighting it and see if that improves the flame and keeps it lit. Otherwise, just replace the thermocouple. Douglas
Hello, It should be blue. If it's got orange tips, it's burning dust, If it's got yellow flames or tips, it may need the air shutter adjusted, regulator pressure adjusted, the vent unblocked or just a real good cleaning. Douglas