Furnace will not start at all; no lights or display

Safety: Use caution when working around electrical panels. If unsure, contact an electrician.

• Check breaker: Locate the furnace breaker in the electrical panel and ensure it is ON. Reset if tripped; if it trips again, do not force it.
• Verify service switch: Ensure the furnace service switch near the unit is in the ON position.
• Inspect power terminals: With power off at the breaker, remove the electrical cover on the IVT furnace and check that line and neutral wires are secure.
• Check internal fuse: Many IVT controls have a low-voltage fuse. Inspect and replace with the same rating if blown. If it blows again, there is a short that needs professional diagnosis.