I own a carrier furnace Infinity installed in 1994 model p21559 B.V. the ignitor does not ignite and the blower does not blow. The thermostat reads hold -AC .This furnace has been a problem since it has been installed.

Looks like you might have lost low voltage. Start by checking the transformer for 24 volts and then proceed to check all items powered by 24 volts to find defective part. Post back if you do not find anything wrong.