Frigidaire LP Gas Range FGF355AVA

[RandyRAS]

Back to pick at the brains of the smartest people that I know....got a Frigidaire Gas Range, FGF355AVA.

about two and a half mo. ago the customer called with the complaint of gas smell from the oven area, checked with a sniffer, and found that the valve was leaking when the unit was off, so we did what I think any other service tech would do, we replaced the valve, now the customer has called back, there is soot, and the smell of gas is present when the unit is on, I looked at it, and it does not look like the valve was converted for LP, the flame is long and yellow, like is was still set up for Natural Gas, but the orfice is cranked down as far as it will go.

The customer has stated that it had been working fine up until about a week ago, and then it started doing this, I have the suspision that it is a fault with the valve, but am also searching for any other probable causes, hence the brain picking,

[Moostafa]

Hello, my brain picking friend. The problem you describe, yellow flame and sooting, is characteristic of an improper fuel-air mixture. As you mentioned, one cause for this is the valve set up for the wrong fuel. You have checked the fuel metering part of the equation, but have you verified the air supply part as well? To do this, simply ensure that the primary air supply shutter on the burner tube is opened all the way.

Another, more subtle cause for this problem is having the metering orifice partially clogged with grease or something else that should not be there. remove the orifice and clean it with 70% isopropyl alcohol and compressed air at a minimum pressure of 80 psi. A rubber-tipped adapter on the end of your air tank will greatly facilitate this procedure.