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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8049
Experience:  Furnace, A/C and heat pump specialist.
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Heating works cooling fan stays on low speed ghm950905dxab,

Customer Question

heating works cooling fan stays on low speed ghm950905dxab
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: filters ok heatblows fine has been this way since installed 6 yrs ago
JA: Do you plan on doing the work yourself?
Customer: me and a tech
JA: Anything else we should know to help you best?
Customer: understand a jumper wire can be installed to by pass the 5 min slow start up
Submitted: 4 months ago.
Category: HVAC
Expert:  airheatman replied 4 months ago.

On the furnace control board you will see a dip switch marked MODE.

Setting the Mode switch to “1 STG” forces the furnace to operate at the furnace’s highest input rate only.

Setting the Mode switch to “2 STG” allows the furnace to operate at the furnace’s highest input AND at an input rate that is 75% of the highest input rate.