I have a 1993 vintage Carrier 58PAV090 111LC which I tried to fire up today, with no ultimate success. That is, the main blower comes on, the inducer blower comes on, the igniter comes on, but no gas flows and no heat results. Here's what I've checked:
- gas is present (I've purged the line to the extent of making sure gas was flowing - removed the sediment trap with the valve shut, opened the valve slightly, smelled and heard gas, shut the valve, replaced the sediment trap);
- confirmed control operation (my control board doesn't have the LED, but there's a test switch, and everything it tests worked);
- confirmed the reset switches switches were not tripped; and
- bypassed the pressure switch and blocked vent safeguard.

Nada - no gas flow, no heat. Any ideas?
Thanks!
Waldemar