Nordyne Downflow Direct Vent Forced Air Gas Oil Furnaces SERIES M1B - Manual (Page 29)

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Control Module Status Indicators - M1M Series
Red LED Indicator Status
Steady ON Control OK
Steady OFF No power
Rapid fl ash False fl ame or internal control fault
One fl ash Limit switch is open
Two fl ashes Pressure switch is open
Three fl ashes Pressure switch is stuck closed
Four fl ashes Lockout due to failed ignition
Five fl ashes L1 neutral reversed or L1 voltage not present on L1
Flame Status - A Yellow LED labeled “Flame” is provided to indicate fl ame status. When fl ame
is sensed, the fl ame LED is lit. If fl ame sense is weak, yellow LED will fl ash.
Control Module Status Indicator - M1B
Red LED Indicator Status
One fl ash
The control is in lock-out because the inducer centrifugal switch is or
was stuck closed.
Two fl ashes
The control is in lockout because the signal was not received by the
control that the inducer centrifugal switch had closed within the time.
Three fl ashes
The control is in lockout because a failed ignition attempt, a gas valve
error, or a false fl ame sensed during the warm up period. If false fl ame
has been sensed, the control will return to normal operation, and repeat
ignition sequence when the false fl ame is not present.
Four fl ashes The control is in lockout due to a failure within the control board
Control Module Status Indicator - M5S Series
The LED indicator(s) on the oil primary control provides lockout, recycle and cad cell indications.
Honeywell R7184 Control
Green LED Indicator Status
On Cad cell is sensing fl ame (could be fl ame or stray light)
Off Cad cell is not sensing fl ame
Flashing - 1/2 sec. on, 1/2 sec. off Lockout/Restricted Lockout
Flashing - 2 sec. on, 2 sec. off Recycle
Beckett 7505 Control
LED Indicator Color On Continuously Flashing
Red Restricted (hard) lockout Soft lockout
Green
Cad cell is sensing fl ame -
(could be fl ame or stray light)
Recycle
Yellow
Pump prime mode or reset
button currently held for 15+ sec.
N/A
Table 9. Control Module Status Indicators