Comfortmaker: Flame Detected With No Call for Heat
What this fault means
The board senses flame when the gas valve should be closed — a serious gas-control fault that locks the furnace out.
Likely causes
- Gas valve leaking by or not fully closing
- Slow-closing valve
- Flame-sensor or control board fault
What you can safely check
- Replace a dirty air filter — restricted airflow causes a surprising share of furnace faults.
- Confirm registers and the outdoor unit are clear of snow, leaves and debris.
- Cycle power at the switch once and let the system retry.
Call a technician — don't keep resetting this
Flame Detected With No Call for Heat is a critical-severity fault. Repeated resets of a safety lockout can mask a serious problem such as a cracked heat exchanger (a carbon-monoxide risk) or a failing compressor. If you smell gas, leave and call FortisBC at 1-800-663-9911 or 911 first.
Related Comfortmaker faults
Comfortmaker furnace showing Flame Detected With No Call for Heat?
CANRO Heating & Cooling — same-day diagnosis across Greater Vancouver. Call 604-359-1081.