Nordyne M1B Installation Instructions Manual page 29

Control Module Status Indicators - M1M Series
Red LED Indicator Status
Steady ON Control OK
Steady OFF No power
Rapid flash False flame or internal control fault
One flash Limit switch is open
Two flashes Pressure switch is open
Three flashes Pressure switch is stuck closed
Four flashes Lockout due to failed ignition
Five flashes L1 neutral reversed or L1 voltage not present on L1
Flame Status - A Yellow LED labeled "Flame" is provided to indicate flame status. When flame
is sensed, the flame LED is lit. If flame sense is weak, yellow LED will flash.
Control Module Status Indicator - M1 B
Red LED Indicator
One flash
Status
The control is in lock-out because the inducer centrifugal switch is or
was stuck closed.
The control is in lockout because the signal was not received by the
Two flashes
control that the inducer centrifugal switch had closed within the time.
Three flashes
Fourflashes
The control is in lockout because a failed ignition attempt, a gas valve
error, or a false flame sensed during the warm up period. If false flame
has been sensed, the control will return to normal operation, and repeat
ignition sequence when the false flame is not present.
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 flame (could be flame or stray light)
Off Cad cell is not sensing flame
Flashing - 1/2 sec. on, 1/2 sec. off Lockout/Restricted Lockout
Flashing - 2 sec. on, 2 sec. off Recycle
LED Indicator Color
Red
Green
Yellow
Table 9. Control Module Status Indicators
Beckett 7505 Control
On Continuously
Restricted (hard) lockout
Cad cell is sensing flame -
(could be flame or stray light)
Pump prime mode or reset
button currently held for 15+ sec.
Flashing
Soft lockout
Recycle
N/A
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