Furnace will not start after a power outage.

Safety first: Turn off power before checking fuses or wiring.

Step-by-step checks:

• 1. Power cycle: Turn furnace power off at the switch or breaker for 5 minutes, then back on. This can clear some lockouts.
• 2. Check control board fuse: Inspect and replace the low-voltage fuse if blown.
• 3. Reset thermostat: Remove thermostat batteries for 1 minute or follow manufacturer reset instructions.

When to call a professional: If the furnace remains unresponsive or shows unusual LED behavior, the Philco control board may have been damaged by a surge and should be tested and replaced.