No Heat

When this becomes an emergency

• The thermostat is set well above room temperature and nothing responds at all.
• The unit is completely silent, with no fan and no click.
• A breaker labeled for the furnace has tripped and won't stay set.
• The rooms farthest from the equipment are already noticeably cold.

What a pro does

Power comes first, every time. A service switch flipped by someone reaching for a light in a dark basement looks exactly like a failed control board, and it costs nothing to rule out. After that, a technician confirms the thermostat is actually sending a call for heat, checks low-voltage continuity out to the equipment, and reads whatever fault code the board is flashing before touching a single part. Rodent damage to thermostat wire is worth mentioning here, because in older houses with wiring run through fieldstone basements and crawlspaces it turns up more often than you'd guess. The usual finding is a safety device doing its job. A rolled-out flame switch, a blocked pressure switch hose, a plugged condensate trap on a high-efficiency unit: each one shuts the system down deliberately, and swapping parts without finding which one tripped just buys another outage next week.

Frequently asked questions

No Heat?

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