Integrated Control Diagnostic Codes (continued)
E 272 | Soft lockout − Exceeded maximum number of recycles. Last recycle due | Check operation of low pressure switch to see if it is |
| to the pressure switch opening. | stuck closed on heat call. Check pressure (inches |
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| w.c.) of high pressure switch closing on heat call. |
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| Measure operating pressure (inches w.c.). Inspect |
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| vent and combustion air inducer for correct opera- |
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| tion and restriction. Clears when heat call finishes |
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| successfully. |
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E 273 | Soft lockout − Exceeded maximum number of recycles. Last recycle due | Check micro−amperes of flame sensor using control |
| to flame failure. | diagnostics or field−installed mode. Clean or replace |
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| sensor. Measure voltage of neutral to ground to en- |
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| sure good unit ground. Clears when heat call finish- |
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| es successfully. |
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E 274 | Soft lockout − Exceeded maximum number of recycles. Last recycle | Shut down system. 1−hour soft lockout. Check firing |
| failed due to the limit circuit opening or limit remained open longer than | rate and air flow. Check for blockage. Clears when |
| 3 minutes. | heat call finishes successfully. |
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E 275 | Soft lockout − Flame sensed out of sequence. Flame signal is gone. | Shut off gas. Check for gas valve leak. 1−hour soft |
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| lockout. Clears when flame has been proven stable. |
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E 276 | Watchguard calibration failure. | Unable to perform pressure switch calibration. |
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| Check vent system and pressure switch wiring con- |
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| nections. 1−hour soft lockout. Clears when calibra- |
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| tion has finished successfully. |
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E 290 | Ignitor circuit fault − Failed ignitor or triggering circuitry. | Measure resistance of hot surface ignitor. Replace if |
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| open or not within specifications. 1−hour soft lock- |
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| out. Clears when flame has been proven stable. |
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E 291 | Heat air flow restricted below the minimum. | Check for dirty filter and air flow restriction. Check |
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| blower performance. 1−hour soft lockout. Cleared |
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| when heat call finishes successfully. |
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E 292 | Indoor blower motor unable to start due to obstructed wheel, seized | Indoor blower motor unable to start (seized bear- |
| bearings. | ing, stuck wheel, etc.). Replace motor or wheel if |
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| assembly does not operate or meet performance |
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| standards. 1−hour soft lockout. Clears after circula- |
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| tor successfully starts. |
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E 294 | Combustion air inducer over current. | Check combustion blower bearings, wiring and |
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| amps. Replace if does not operate or does not meet |
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| performance standards. Clears after inducer current |
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| is sensed to be in−range after the ignition following |
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| the soft lockout or reset. |
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E 295 | Indoor blower motor temperature is too high. | Indoor blower motor over temperature (motor |
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| tripped on internal protector). Check motor bearings |
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| and amps. Replace if necessary. Cleared after |
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| blower demand is satisfied. |
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E 310 | Discharge error temperature sensor failure. Only shown if shorted or | Compare outdoor sensor resistance to temperature/ |
| out of range. | resistance charts in installation instructions. Re- |
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| place sensor if necessary. Cleared in Communicat- |
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| ing mode: 30 seconds after fault recovered. In Non− |
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| Communicating mode: Cleared after the current |
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| heat call is completed. |
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E 311 | Heat rate reduced to match indoor blower air flow. | Warning Only. Furnace blower in cutback mode due |
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| to restricted airflow. Reduce firing rate every 60 |
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| seconds to match available CFM. Check filter and |
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| duct system. To clear, replace filter if needed or re- |
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| pair/add duct. 2−stage controls will reduce firing rate |
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| to 1st stage. Clears when heat call finishes success- |
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| fully. |
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