My 8 year old furnace fan sounds like it is stuck or binding (had a problem like that with twin furnace for first floor) This unit heats the second floor of a small comm.space. Heat will run for a while, then fan will hum and furnace stops. If I kill power for a half hour and restore, it fires up fine, then repeats problem. Any thoughts? Thanks
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Hi, You are right. The outside unit starts quickly. The humming will either be the evaporator fan or the AC compressor itself. If you can reach into the evaporater fan with something narrow and stiff you may be able to see if the fan turns. Sorry for the trouble you are having. One or the other is trying but unable to start, hence the humming. Wayne
Without being there to see it and have only your description in front of me, it sounds like the fan blade could be out of balance.......but it sounds more like a loose fan blade hub. Most Goodman units offer a minimum 5 year parts warranty. The Labor warranty is questionable, but the installing contractor or the Goodman Distributor should be able to give you that information. Of course this would cover manufacturer problems and not physical damage. As far as a history of this problem with Goodman..........I've seen it with every brand. If there is a problem getting it under warranty, you might be able to purchase the blade yourself. Before replacing the fan blade, I recommend disconnecting the motor wires from the contactor, tape off the ends and remember exactly where they were attached.....then start the unit to see if the noise is still evident, if so, it's probably your compressor. I recommend a certified repairman....not the one that quoted you $800.00. If you hear only the compressor start up and not the loud noise you are discribing, then try replacing the blade first.
I hope you find this information to be very helpful to you. :-)
69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.
Check the drain tubes inside the furnace. There may be a loose connection or a split tube.
The unit could also leak from the gasket between the secondary heat exchanger and the vent fan housing. The secondary heat exchanger ould also be leaking or cracked.
Hope this helps.
Most likely the cause is that the furnace is firing too hot. When a furnace is installed and set up, the manifold gas pressure and fan speed has to be set by the technician so that the temperature rise through the furnace is a maximum of 50 deg F (i.e. if air enters the furnace at 68 deg F it come out no hotter than 118). The target temperature rise on any gas furnace is anywhere between 30 and 50 deg F. If the furnace runs too hot, either the manifold gas pressure must be turned down or the fan speed must be turned up to keep in this range.