Integrated Control Diagnostic Codes - Lennox EL280UH Installation Instructions Manual

Integrated Control Diagnostic Codes

FLASH CODE
(X + Y)
Pulse A 1/4 second flash followed by four seconds of off time.
Heartbeat Constant 1/2 second bright and 1/2 second dim cycles.
LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains off for four
X + Y
seconds, then repeats.
Pulse Power on − Standby.
Heartbeat Normal operation − signaled when heating demand initiated at thermostat.
1 + 2 Low flame current −− run mode.
1 + 3 Flame sensed out of sequence −− flame still present.
2 + 3 Low pressure switch failed open.
2 + 4 Low pressure switch failed closed.
2 + 5 High pressure switch failed open.
2 + 6 High pressure switch failed closed.
2 + 7 Low pressure switch opened during ignition trial or heating demand.
3 + 1 Limit switch open.
4 + 1 Watchguard −− Exceeded maximum number of retries.
4 + 2 Watchguard −− Exceeded maximum number of retries or last retry was due to pressure switch opening.
4 + 3 Watchguard −− Exceeded maximum number of retries or last retry was due to flame failure.
4 + 5 Watchguard −− Limit remained open longer than three minutes.
4 + 6 Watchguard −− Flame sensed out of sequence; flame signal gone.
4 + 7 Ignitor circuit fault −− Failed ignitor or triggering circuitry.
4 + 8 Low line voltage.
5 + 1 Hard lockout −− Rollout circuit open or previously opened.
5 + 2 Control failed self check, internal error (control will restart if error recovers).
5 + 3 No Earth ground (control will restart if error recovers).
5 + 4 Reversed line voltage polarity (control will restart if the error recovers).
5 + 6 Low secondary (24VAC) voltage.
Error Code Storage
The ignition control stores the last ten error codes in
memory. The codes are retained in case of power loss.
Error Code Review
1 − Short R (2) to (1). Within 1/2 second, the STATUS LED
will stay lit continuously to indicate that the short was
sensed.
2 − Continue to hold the short between R (2) to (1). After 5
seconds, STATUS LED will go from being continuously
lit to off. This indicates that error code review is pend-
ing.
3 − Remove R (2) to (1) short within ten seconds of STA-
TUS LED turning off. This activates error code review.
4 − Last ten error codes will be flashed on the STATUS
LED.
STATUS / ERROR DESCRIPTION
FLASH CODE DESCRIPTIONS
FLAME CODES
PRESSURE SWITCH CODES
LIMIT CODE
WATCHGUARD CODES
HARD LOCKOUT CODES
5 − After final error code is indicated, STATUS LED will
flash to indicate normal operation.
Clearing Error Codes
1 − Short R (2) to (1). Within 1/2 second, the STATUS LED
will stay lit continuously to indicate that the short was
sensed.
2 − Continue to hold the short between R (2) to (1). After 5
seconds, STATUS LED will go from being continuously
lit to off.
3 − Continue to hold the short between R (2) to (1) beyond
ten seconds after STATUS LED has turned off. STA-
TUS LED will turn on, indicating that error codes have
been cleared.
4 − Remove R (2) to (1) short. STATUS LED will flash to in-
dicate normal operation.
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