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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22510
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a goodman GM4950904 gas furnace. the blower is always

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I have a goodman GM4950904 gas furnace. the blower is always on, even with the thermostat disconected at the unit. the furnace doesnt fire, it just blow cold air. What is the problem?

This means the furnace is most likely locked out on a safety.


Does circuit board have a red blinking light?



Customer: replied 6 years ago.
yes, it blinks 6 times, then pauses and repeats


Thank you....


Are you familiar with where the burner compartment is?



Customer: replied 6 years ago.

Around this burner compartment will be flame roll out switches.

Goodman B1370154 B13701-54 Flame Rollout Switch

press center buttons and see if one clicks.



Customer: replied 6 years ago.
none clicked


Thank you,


there can also be a vent safety switch like the roll out...follow the wires from the roll outs and see if it leads to another snap disc.



Customer: replied 6 years ago.
I found a total of 4 snap discs. none of them reset



Just to make sure of code vs model. Look on the blower door and see what 6 blinks equates to on your version.



Customer: replied 6 years ago.
open rollout or open fuse


Ok...on right track...look on circuit board for 5 amp blade fuse and see if blown.



Customer: replied 6 years ago.

the fuse was indeed blown. I replaced it and the unit is working as it should. I didnt see that fuse until I moved some wires around.


Thank you for your help please is usually a short or bad spot in wire somewhere in the thermostat wiring.furnace wiring if fuse blows during heat.


Thank you for your patience!



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