G71MPP series units are high−efficiency multi−position
(upflow, downflow, horizontal right and left) gas furnaces
equipped with variable capacity gas valve, variable speed
combustion air inducer and variable speed indoor blower
motor. All models are designed only for direct vent (dual
pipe) venting system. G71MPP units are available in heating
capacities from 66,000 to 132,000 Btuh (19.3 to 38.6
kW) and cooling applications from 2 to 5 tons (7.0 kW to
17.5 kW). Refer to Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. G71MPP model
units are equipped with the Lennox SureLight® variable capacity
integrated control. All G71MPP units meet the California
Nitrogen Oxides (NOx) Standards and California Seasonal
Efficiency requirements.

LED 7 Segment Status / Error Code
Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be
displayed. Release the button when the desired mode is displayed.
When the solid “E” is displayed, the control enters the Error Code Recall mode. Error Code Recall mode menu options: No change (displaying
error history) remains in Error Code Recall mode; solid “≡” exits Error Code Recall mode; and solid “c” clears the error history. Must
press button while flashing “c” is displayed to clear error codes.
When the solid “−” is displayed, the control enters the Field Test mode. Field Test mode menu options: Solid “C” starts pressure switch
calibration; blinking *−” exits Field Test mode.
Flash Code Diagnostic Code / Status of Furnace
* Idle mode (Decimal blinks at 1 Hz 1/2 sec. On and 1/2 sec. Off
A CFM Display (1 sec. On 1/2 sec Off, CFM value)
C Staged Cooling (1 sec. On 1/2 sec. Off or 2 Stage 1 sec. pause CFM pause, Repeat codes)
d Dehumidification Mode (1 sec. On 1 sec Off, CFM, Pause Repeat Codes)
h Variable Capacity Heat (1 sec On 1/2 sec Off % of input rate Pause CFM Pause Repeat Codes)
H Staged Heat (1 sec On 1/2 sec Off or 2 Stage 1 sec, CFM Pause Repeat Codes)
110 Low Line Voltage
113 High Line Voltage
115 Low 24V (control will restart if the error recovers)
125 Control failed self check, internal error, failed hardware. Control will restart if error recovers
180 Outdoor Air Sensor Failure − no error if just disconnected, only show if shorted or out of range
200 Rollout circuit open or previously opened
201 Circulator / COM failure − unable to communicate w / circulating motor (blower)
202 Circulating motor / resistor mis−match or resistor missing
204 Gas Valve Miswired − Resume normal operation after error corrected
223 Low Pressure Switch Failed Open
224 Low Pressure Switch Failed Closed
225 High Pressure Switch Failed Open
226 High Pressure Switch Failed Closed
227 Low Pressure Switch Opened during TFI or Run mode
228 Unable to perform successful pressure switch calibration mode
240 Low Flame Mode − Run Mode
241 Flame sense out of sequence − flame still present
250 Limit switch circuit open
270 Watchguard − Exceed maximum number of retries. No flame current sensed
271 Watchguard − Exceed maximum number ignition retries where the last retry was due to pressure switch
opening
272 Watchguard − Exceed maximum number of recycles where the last recycle was due to pressure switch
opening
273 Watchguard − Exceed maximum number of recycles where the last retry was due to flame failure
274 Watchguard − The limit remained open longer than 3 minutes
275 Watchguard − Flame sensed out of sequence; flame signal gone
290 Ignitor circuit Fault − failed ignitor or triggering circuitry
291 Restricted airflow − available CFM below min. firing rate
292 Circulator motor unable to start (seized bearings, stuck wheel, etc)
294 Inducer motor amp draw too high
310 Discharge air sensor failure − no error if just disconnected, only show if shorted or out of range
311 Restricted airflow heating mode − target input rate reduced to match available circulator CFM
312 Restricted airflow cooling or continuous fan mode − information only

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