We monitor and control several Carrier 48TJD008-14 with a DDC system and have noticed several lockouts recently. The heating stage 1 signal has been present for days but the supply air does not rise. Turning off the stage 1 heat signal and then restoring it seems to reset the unit. This seems to be a soft fault that can be reset with out resetting the power.
We won't reset them in the future so that we can have a tech check for fault codes, but until then. Are there any faults that can be reset in this manner?
The units were manufactured around Jan 2000, and the ignition control board says Automatic Ignition Systems H33WP002A.