Originally Posted by friendly rv
My sw6p suburban WH won't light. Here is what has happened so far. I order a new pilot light and thermocouple assy. When I tried to light it by holding down the black knob in pilot position I got a small pop explosion at the pilot light burner. When that happened I notice that the burner assy orifice was lit with a small flame, I turned the black knob to the off position and started over. I did this several times with the same results, a pop explosion at the pilot light burner and the burner assy lighting instead. My next step was to order and new gas control valve assy. After installing this, I got the same results. Can anyone help me as I cannot afford a service tech. thank you very much ahead of time.
Based on your first statement I would have suggested a new control valve........
Based on second statement.........very strange!
Flame at burner Orifice suggest blow back.
Burner tube/combustion chamber
When you push/hold knob in pilot position, light pilot flame the flame heats thermocouple which then hold gas valve open and knob can be turned to ON for Main flame
Pop/explosion at Pilot means air/fuel mixture is RICH
Pilot gas is controlled by the control valve so NEW pilot assembly should be free flowing
New Control Valve would negate a Blown ECO ----temp probe that sticks into the tank. Bad ECO affect pilot and main gas flows
Best I can suggest....
Remove Pilot Assembly and check for obstruction/dirty orifice
*Blow thru it backwards etc but do NOT Poke anything thru orifice
Clean up the burner tube and combustion/exhaust chamber
Check LP System Pressure (any problems with other appliances???)
With all those new parts it should fire right up
Verify you have good propane flow TO the gas control