I have an Amana 90% furnace (about 18 years old - 45000 BTU) with dual inshot burners. I have recently bought this home, and suspect that this problem has been there since installation. The furnace seems to heat OK, but the burners (2) often flashback into the interior of the burner. Sometimes it will light properly, but mostly starts up with full flashback burning inside - then will sometimes clear and burn properly. When burning 'correctly', the burners 'pulse' a bit - not bad, but I think the regulator is pulsing the pressure at about 2 per sec pulse. These issues may or may not be related as it doesn't seem to affect the flashback.
I have cleaned and checked everything I can think of. There does not appear to be a crack in the chamber since there is NO change when the blower starts up. Water is properly coming out of the drain and flows out with no problems. The vent flue is clear and the inducer motor blows properly.
The furnace seems to work properly in every way except for the burner flashback. I even tried new burners with the same result. I set up my office in the basement and HEARD the problem - I doubt the previous owners ever noticed it since they didn't "use" the basement routinely.
Anyone got any idea what else to look for ??
tia,
Steve
I have cleaned and checked everything I can think of. There does not appear to be a crack in the chamber since there is NO change when the blower starts up. Water is properly coming out of the drain and flows out with no problems. The vent flue is clear and the inducer motor blows properly.
The furnace seems to work properly in every way except for the burner flashback. I even tried new burners with the same result. I set up my office in the basement and HEARD the problem - I doubt the previous owners ever noticed it since they didn't "use" the basement routinely.
Anyone got any idea what else to look for ??
tia,
Steve