Hello all.
Done extensive reading and analysis of voltages and sensors and am completely baffled as to why this thing won't light. IF code after 3 lighting attempts as usual. It is a barely used heater recently converted NG H250 induced draft low NOx to propane (new burner orifices and White Rogers NG-LP conversion kit for the exact valve - consisting of a spring and 2 stickers, lol.) Just got a new 120 gal LP tank and 11" WC pressure to the valve. Valve confirmed working (bypassed board and manually opened valve to light burners to ensure flow - not for the faint of heart, btw.) The valve regulator is screwed nearly all the way down to ensure plenty of flow - maybe too much flow?
The heat exchanger is like new as are all the sensors/ignitor. I bought & installed a new ignitor - no change. the flame sensor looks new, but just to make sure, I have an identical generation H400 and have interchanged flame sensors, control boards, ignitors - no change - same behavior.
This thing has never lit. It's not like it lit and is not sensing a flame and then shuts off. I hear the gas valve open, hear the gas flowing - 4 seconds of lighting attempt and then off. Display is fine, blower's fine. 110V and 24V sources all check out. The ignitor is cherry red during lighting attempts. What the actual 'F' is going on?
None of the prior posts on similar topics address this particular behavior, especially considering I have completely dusted/cleaned/vacuumed this unit and all orifices are brand new as is the condition of the heat exchanger/blower.
Any insight appreciated!
Done extensive reading and analysis of voltages and sensors and am completely baffled as to why this thing won't light. IF code after 3 lighting attempts as usual. It is a barely used heater recently converted NG H250 induced draft low NOx to propane (new burner orifices and White Rogers NG-LP conversion kit for the exact valve - consisting of a spring and 2 stickers, lol.) Just got a new 120 gal LP tank and 11" WC pressure to the valve. Valve confirmed working (bypassed board and manually opened valve to light burners to ensure flow - not for the faint of heart, btw.) The valve regulator is screwed nearly all the way down to ensure plenty of flow - maybe too much flow?
The heat exchanger is like new as are all the sensors/ignitor. I bought & installed a new ignitor - no change. the flame sensor looks new, but just to make sure, I have an identical generation H400 and have interchanged flame sensors, control boards, ignitors - no change - same behavior.
This thing has never lit. It's not like it lit and is not sensing a flame and then shuts off. I hear the gas valve open, hear the gas flowing - 4 seconds of lighting attempt and then off. Display is fine, blower's fine. 110V and 24V sources all check out. The ignitor is cherry red during lighting attempts. What the actual 'F' is going on?
None of the prior posts on similar topics address this particular behavior, especially considering I have completely dusted/cleaned/vacuumed this unit and all orifices are brand new as is the condition of the heat exchanger/blower.
Any insight appreciated!