I have a Rheem Centurion II furnace which is short cycling, running for a few minutes but never getting near the setpoint temperature.
The pressure switch was replaced, but not with the same part, due to a previous problem with the switch sticking open. The new switch fixed that problem.
Now the indicator is that the control board is flashing a code indicating, 'one hour lockout'. Not sure what could be causing this other than a intermittent flame sensor.
Do you have any ideas for me
Thanks so much,
Don