Goodman gas furnace fan problem


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Old 09-15-12, 11:29 AM
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Goodman gas furnace fan problem

So the heater has been broken since I bought the house. I kick the thermostat on and it fires right up. After about 45 seconds or so I can here a click (I'm assuming the fan relay) but no fan. It soon sets the thermal protection and shuts down. Normally I would jumper the fan to start with but this thing has about 16 wires going to it and controlled by a circuit board so I don't know where to start. Model is gcv90704cxa. I can spin the fan freely so it is not froze up. I don't want to start throwing parts at it as they are expensive. Any input would be appreciated.
 
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Old 09-15-12, 11:59 AM
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Take the cover off the burner compartment of the furnace.

Observe the sequence of events that occurs at the furnace when you turn up the thermostat and post that sequence of events in order and in detail.
 
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Old 09-15-12, 03:08 PM
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Turn on thermostat. Inducer fan comes on. Burners fire up nicely. 45 seconds later I here a click which normally would be a fan relay I assume. Main fan does not come on or even attempt to come on. Burners continue to fire for about 30 seconds and then shut off due to overheating because the main fan is not working. Cuircut board is flashing code for thermal protection (as it should be due to overheating but no other code.
 
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Old 09-15-12, 08:10 PM
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For openers, the operating manual is available at

http://site.famousparts.com/goodman/RT6612011.pdf


I'd make a copy and leave it at the furnace.
 
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Old 09-16-12, 12:03 AM
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Does the motor operate in continuous fan mode? (cooling mode)

If the t-stat only has two wires, jumper terminals G and R at the furnace.

Re-seat the motor connections.

The problem could be with the circuit board, connection between the board/motor, or the motor (which consists of a control module and the actual motor) itself.

Your furnace has a proprietary electronically controlled ecm motor which is very expensive to replace. The good news is that it definitely still has a parts warranty - contact a goodman dealer for service.
 
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Old 09-16-12, 12:08 AM
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Page 107-112 of http://www.alpinehomeair.com/related...leshooting.pdf have ecm motor troubleshooting instructions
 
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Old 09-16-12, 06:13 AM
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how old is the furnace? It may have a 10yr part warranty.
 
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Old 09-17-12, 01:46 PM
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Thank you to all so far for your help. As I purchased this home with the furnace installed already Goodman makes it very clear via there website that there is no warranty and I have no way of knowing how long its been installed.

That aside, I jumpered R and G with no results from the fan. I checked across them and they are showing 24 volts. Removed the control connector harness from the motor side as shown on page 109 (thank you Muggle) and tested. Terminals 1 and 12 show 24 volt but terminals 1 and 15 show zero but are supposed to show 13 volts. I wiggle tested all the connectors along with removing them and visually checking them and all look ok. This is leading me to believe the circuit board may have a fault. Is there anything else I should check before throwing a $200 board at it?
 
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Old 09-17-12, 03:18 PM
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So you have a 5 year warranty per the warranty card since you are not the original owner.
If the above warranties do not apply, then the HEAT EXCHANGER
is warranted for a period of 20 YEARS, and all remaining parts
are warranted for a period of 5 YEARS
What is your serail number and I can tell you how old it is.
 
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Old 09-17-12, 04:20 PM
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the serial number is 0507784733
 
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Old 09-17-12, 04:32 PM
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it was built in 2005 so no warranty.... It is ALWAYS worth checking....
 
 

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