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My Rudd achiever 90+ furnace won't start. Have had a tech here twice from the installing contractor to correct this. Each time its spider eggs blocking a tube connecting a sensor according to them. Any ideas beyond their suggestion of spraying pesticide inside the air intake and the furnace itself. Is there a service manual available on line somewhere???

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Hmm, spiders in the pressure switch tube, not impossible however they usually go for the gas orifice, and yes I'm serious. If the problem is in the pressure switch tubing it is usually condensation, which is normally present in the vent system. If the tube loops down and back up then this makes a water trap, which will not allow the pressure switch to sense the pressure from the vent motor. Otherwise there could be an issue with the venting, also any dips or sags will cause a water trap. did he use a manometer to determine this issue? if the venting, the heat exchanger and the connecting tube are fine, then it could be a defective pressure switch. It's simply a proccess of elimination, by inspection, not parts replacement. The pressure switch is nothing more than a diaphragm membrane which is pulled or pushed by the pressure difference created by the vent motor, a calibrated spring determines how much force is needed to move the diaphragm and close an electric switch. Not sure if that will solve the issue, but it should give you somewhere to start.

Posted on Sep 26, 2009

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