Bryant 355MAV Error Code 11: No Previous Code
What Does Code 11 Mean?
Status code 11 on the Bryant 355MAV means "No Previous Code" — the control board's memory contains no stored fault history. It is an all-clear message, not an error.
The Variable Speed Furnace Control keeps recent diagnostic codes so a technician can review what happened even after the furnace returns to normal. On this board those stored codes are erased automatically after 72 hours. Code 11 appears when the stored history is read and found empty, meaning either nothing has faulted recently or the 72-hour timer already cleared the record.
Because it reports the absence of a fault, code 11 requires no repair. It is worth understanding in contrast to active codes: if your furnace is misbehaving right now but shows code 11 in stored history, the problem may be intermittent or too recent to have logged. In that situation, watching the LED live during a heating cycle is more useful than reading stored history.
What You'll Notice
- Reading the stored status history returns a 1-short/1-long flash pattern for code 11 and nothing else
- The furnace otherwise runs normally, with no active fault being flashed during operation
How This Is Diagnosed
Code 11 is itself the result of a diagnostic step rather than a symptom to chase. When the stored-code history is retrieved from the board and it flashes 11, that confirms the memory is empty. The next logical move, if a problem is still suspected, is to stop relying on stored history and instead observe the LED in real time during an actual call for heat so any intermittent fault can be caught as it happens.
- The furnace is misbehaving now even though stored history shows only code 11 — a technician can watch it run live to catch an intermittent fault
- You want a seasonal inspection despite no stored codes, which is reasonable preventive maintenance
Frequently Asked Questions
What does code 11 mean on a Bryant 355MAV?
It means "No Previous Code" — the board has no stored faults. It is a normal status, not a problem to fix.
My furnace acted up but only shows code 11. Why?
Stored codes are erased after 72 hours, and an intermittent or very recent fault may not have logged. Watch the LED during an active heating cycle to catch the code as it occurs instead of relying on stored history.
Sources
✓ Verified against manufacturer service manual — March 2026