Pulse
Power on / standby
This code typically points to
- No heat call present
- Board energized and idle
Next checks to confirm
- Confirm 24 VAC present to control
- Confirm thermostat is not calling for heat
- If unit should be heating, verify W input and call path
Escalation
None; normal standby status
Reset behavior
Not a fault; state changes when operating demand changes.
Informational
No action needed