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I have now had to replace the flame sensor after cleaning it no longer helped. The blower motor gave out, which I believe may have been the starter circuit which caused the motor to heat up and wreck the bushings. The three light problem went away a week after a guy came out and put on a...

Bigdog1: that is sort of scary since the purpose of all of this is to assure the house is not filling up with CO. All the problems we are having to keep us safe and yours works now with the safety devices bypassed. I will have to say again, poor design.

I see I never posted an update. I was working out of town and my wife was shutting the furnace off and restarting it to keep the house warm. I got a repair man in. His theory was that if the cycle time was too short, the vacuum in the flue was not dropping enough to let the switch open. He...

Wind gusts on the roof causing back pressure in the flue. This would not depend on the physical location of the actual furnace. That is what I meant. It makes sense to me, and I say it is a bad design in that if the wind caused back pressure, and then the situation is resolved, it should not...

Someone on another thread stated this is caused by wind from a certain direction. That was my first reaction as the first time it was very windy. Then I say that is a bad design, if we have to manually reset it after a gust of wind. Wind was my first thought as the first time it happened, it...

Then I say that is a bad design. Wind was my first thought as the first time it happened, it was indeed very windy. Since where I am from, the wind is almost always from the west. I could see that perhaps wind from an unusual direction could cause this and that is why no problem for the past...

The problem went away. The furnace has been working for more than a week now. This makes me think it is the mother board, as modern electronics is prone to doing wacky things.

That sounds incredibly good. I will see if anyone has something like that in my area.

The furnace has been running without problem for 3 days now despite not changing anything. This makes me think it is the board. I am afraid to leave the house unattended in case the furnace quits again and the pipes freeze. Difficult to fix a problem without it shutting down on its own.

It appears the $120 spent has had no impact. The wife suspects that the furnace quits more often than before the mods. My next step will be to replace the mercury thermostat with a new fangled electronic one as the guy I gave the money to suspected that calls for heat were coming too quickly...

That guy came and charged me $120. He set the thermostat for a longer cycle, thinks he might have cleaned the vacuum nozzle, and put a longer hose going to the pressure switch. The theory is that the thermostat was calling for heat while the inducer motor was still turning. This way, the...

I made an appointment with some guy for Monday. The inducer does stop running sometimes. It is just difficult to sit by the furnace all day to see what happens when it stops functioning correctly. Of course, when the temperature drops, there is a already a call for heat. So it is difficult to...

Is it possible that the pressure switch has to open at some point in the cycle? What if the induction blower stayed on sometimes when it was supposed to be off. This would not allow the pressure switch to open and then the cycle would not start. Me pinching the hose to the pressure switch...

I tested the vacuum - 200Pa or 0.75in H20. Is that good or bad?

And back to the low or intermitent vacuum. I agree that this could be a problem, but I still don't know why just pinching the hose would make the furnace start. If it is a case of intermitent vacuum, then the symptoms should be the same as pinching the hose (removing the vacuum and putting it...

I agree with this last post. At first the idea of water building up made sense. I have never seen any drains on any furnaces I have owned, and I do not see one on mine. I know it is not hooked up to the sewer system and there is never any water on the floor, so I suspect the 80% furnaces do...

Thanks for the reply, but I want to ensure that the switch would work in a way that seems counter intuitive to me. So even though if I take the hose off and hold the hose close to the inlet of the switch and it will work every time, you think it sounds like not enough vacuum? I was thinking...

I posted a reply on another thread and did not get any response, so I am starting a new thread. I think I read all threads on this topic as I thought I had a similar problem. I get the three blinking lights after the furnace works for a few hours every day and I need to manually reset the...

I read this thread and I thought I had a similar problem. I get the three blinking lights every day and need to manually reset the furnace. I replaced my pressure switch and I still have the problem. If I shut the furnace off and turn it on, the furnace will light. If I squeeze the tube to...