I have a five year old Carrier Weathermaker 9300TS furnace. Earlier this year I had to have the blower motor replaced for the first time. Within the last week or so when the furance starts up, the motor is in a low speed to clear our fumes...when it gets into the next speed to start heating the air, I hear a knock, sounds like something metal hitting. Before I call the repair company that charged me almost $600 for the blower motor, any suggestions on what this might be doing to cause the knock? Other than that, the furnace is working fine (and hopefully for a long time).
I have the same problem except my furnace is 2 months old... the company owner came over and said... "since your furnace is on the main level you can hear it, most furnaces are in the basement." Then he left...I have the same problem except my furnace is 2 months old... the company owner came over and said... "since your furnace is on the main level you can hear it, most furnaces are in the basement." Then he left...
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Check the pilot lt. If its out shutdown your furnace and call a repairman. If the pilot light is on, the flame sensor might have gone out. It's a long silver sensor that sits in the pilot light flame and senses when the flame is present. If it isn't working the furnace will automatically shut down.
Check by turning the unit off and turn the fan to on. Do you hear the noise now? The noise your hearing could be coming from your combustion fan assembly instead. Newer furnaces have a in-shot burner and are nosier than the old style of heater.
Hi,
Yes, That is normal for many furnaces, not just the Carrier...
Seems to be a bit dumb but then the ones who desogn these things are sitting behind desks and not out in the field working on them. I'm sure they have a perfectly good reason to have the furnace do that but I have never figure it out....
It does get your attention when the furnace is there running for ever, blowing cold air and burning up your electric....
You just hope that it does not happen when you are away for an extentend period of time...as you said.
Always make sure that if you have someone checking in on your place that they verify the temperature and not just peek in and say yup the furance is running...
I hope that this will help you to solve your problem!
easy way to fine the high usage is to turn everything off and watch your meter and have someone start turning thing back on and watch for the most usage of power
ecms are pretty reliable and electronic failure is much more common than bearing or bushing wearout. i suspect the fins on the blower may be coming loose from their pressed on spline and that will start a vibration or shimmy or you could have thrown a weight that balanced the wheel . best to use to warranty to get a new wheel. good luck
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.
The filter should be located in the return air flow duct either inside the furnace or in the ductwork you should have it inspected by a service contractor as far as when it should be replaced depends on the condition of the heat exchanger and overall condition of the rest of the parts it could start to nickel and dime you
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