2nd stage blower not kicking in

Old 01-12-22, 04:30 AM
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2nd stage blower not kicking in

I have an American standard 2 stage furnace and a thermostat model ACONT624AS42DAA. The 2nd stage is not kicking in. Before I go too far into troubleshooting I wanted to make sure that it wasn’t something turned off in the thermostat. I am unable to access the service level in the thermostat. The select key will not work at that level. Is there a code somewhere to access this level to make sure it is set correctly? The screen is unlocked.
Old 01-12-22, 11:31 AM
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Welcome to the forums.

Check the wiring at the control board and see if there is a thermostat wire on the W2 terminal.
The control board can be set to handle two stages with a standard thermostat.

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