How to Fix / Troubleshooting

Safety: Turn off power and gas. Condensate areas can contain acidic water; wear gloves and eye protection.

Steps:

Check condensate trap and drain: On condensing Ideal furnaces, locate the plastic condensate trap and hoses. Remove and flush the trap with clean water to remove sludge. Ensure hoses are not kinked and the drain line is clear.
Inspect flue termination: From outside, verify that the flue outlet is clear of debris, snow, or ice.
Listen to inducer: Restore power and call for heat. The inducer should start smoothly and reach full speed. Grinding or squealing noises indicate a failing motor.
Check fan proving switch tubing: With power off, inspect the tubing from the inducer to the proving switch for splits or water. Replace or clear as needed.
If F6 remains: The fan proving switch or inducer assembly may require replacement and should be tested by a qualified technician.

Ideal furnace shows F6, inducer runs but ignition sequence does not proceed, or unit cycles without lighting

Possible Causes