Honeywell DBC2000E10 Series, Handbook, Page: 22 / 34

ENS7003R16 KO65 2013 22
Table 8: Error condition and LED status
Sequence
Error condition
Indicator LED
status (*1)
All
Safety limits opened at any time (no voltage present at T18 (STD model) or
T19 (ENH/ULT model)
●○○○○○○◐
Standby (*2)
Air flow switch remains ON (closed) for more than 5 minutes, or START position
interlock switch remains OFF(opened) for more than 5 minutes. ●◐○○○○○◐
Flame signal is present
●○○○○○◐◐
Blower motor is energized
●◐○◐◐○○◐
Pre-purge
Air flow switch remains OFF for more than 5 minutes after the heat demand has
started. ●◐○○○○○◐
PURGE position interlock switch remains OFF for more than 5 minutes after the heat
demand started.
●◐◐◐○○○◐
Both PURGE and START position interlocks ON at the same time during prepurge
period
●◐◐◐○○○◐
START position interlock remains OFF more than 5 minutes after pre-purge has
finished ●◐◐◐○○○◐
Air flow switch goes ON within 5 minutes after the heat demand started, but air flow
switch goes OFF again. ●◐○○○○○◐
Flame signal is present.
●◐○○○○◐◐
Ignition Standby
Air flow switch goes OFF ●◐○○○○○◐
Flame signal is present
●◐○○○○◐◐
Pilot Ignition
Air flow switch goes OFF ●◐◐○○○○◐
Ignition failure (flame signal is not present after ignition-trial). ●○◐○○○○◐
Pilot only
Air flow switch goes OFF
●◐○◐○○○◐
No flame signal ●○○◐○○◐◐
Main ignition
Air flow switch goes OFF
●◐○○◐○○◐
No flame signal
●○○○◐○◐◐
Main ignition
Stabilization
Air flow switch goes OFF ●◐○○◐○○◐
No flame signal
●○○○◐○◐◐
Run
Air flow switch goes OFF ●◐○○○◐○◐
No flame signal
●○○○○◐◐◐
Post-purge
No power is supplied to Terminal 3 because of internal relay contact failure. ●◐○◐◐○○◐
Flame signal is present for more than 10 seconds after heat demand has ended.
●○○○○○◐◐
Air flow switch keeps ON more than 5 minutes after post-purge.
●◐○○○○○◐
All
1. Line voltage out of specs for more than 2 seconds
2. Line frequency out of range for more than 2 seconds
3. Excessive noise on power line or in the area
4. Internal device problem: CPU clock out of sync
●○○○○○○●
*1 : For LED indication,
○
means ‘off’,
●
means ‘illuminated’,
◐
means ‘blinking’.
The LEDs are arranged in the following order: Standby, Purge, Ignition, Pilot, Main, Modulate, Flame and Alarm at the left
front side of the DBC2000.
*2 : If an error occurs during Standby, the DBC2000 will not lock-out but LEDs indicate the current error status.
In this case, the DBC2000 cannot start before the error is resolved.