Table 5. Alert Codes and Troubleshooting | Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in the Installer | |||
alert button. Minor and Moderate alerts are found only in the Installer alert button. | ||||
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Alert |
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Code | Priority | Alert Text | Steps to clear | |
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226 | Critical | (Furnace) The furnace high pressure switch is | Check operation of high pressure switch closing during a heat call. Measure operating pressure | |
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| stuck closed. | (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The | |
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| alarm/fault clears after the issue is corrected. | |
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227 | Moderate | (Furnace) The furnace low pressure switch is | Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating | |
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| open in run mode. | pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. | |
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| The alarm/fault clears after the issue is corrected. | |
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228 | Moderate | (Furnace) The furnace control is not able to cali- | Unable to perform pressure switch calibration. Check vent system and pressure | |
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| brate the pressure switch. | switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a success- | |
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| ful calibration. | |
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229 | Minor | (Furnace) The furnace control has switched to | IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. No | |
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| high fire ignition because the low fire pressure | action is needed. | |
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| switch did not close in the allowed time. |
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240 | Moderate | (Furnace) The furnace flame current is low. | Check micro−amperes of the flame sensor using thermostat diagnostics. Clean or replace the flame | |
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| sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm clears after a | |
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| proper micro−amp reading has been sensed. | |
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241 | Critical | (Furnace) The furnace flame is going out while | Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault will clear | |
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| the furnace is heating. | when a heat call ends successfully. | |
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250 | Moderate | (Furnace) The furnace primary limit switch is | Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the ductwork. | |
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| open. | Check for proper air flow. If limit switch is not closed within 3 minutes, the unit will go into 1−hour | |
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| Watchguard mode. The alarm/fault will clear when a heat call ends successfully. | |
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252 | Moderate | (Furnace) The furnace discharge air−tempera- | Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will clear when | |
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| ture is high. | a heat call ends successfully. | |
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270 | Critical | (Furnace) The furnace is in Watchguard mode. | Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor current. Check | |
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| The furnace igniter cannot turn on the flame. | for dirty filters. The alarm/fault will clear on successful ignition. | |
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271 | Critical | (Furnace) The furnace is in Watchguard mode. | Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating | |
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| The furnace low pressure switch is open. | pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. | |
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| The alarm/fault will clear on successful ignition. | |
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272 | Critical | (Furnace) The furnace is in Watchguard mode. | Check operation of low pressure switch to see if it is stuck open during a heat call. Measure operat- | |
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| The furnace low pressure switch is open during | ing pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restric- | |
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| run mode. | tion. The alarm/fault will clear when a heat call ends successfully. | |
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273 | Critical | (Furnace) The furnace is in Watchguard mode. | Check micro−amperes of flame sensor using thermostat diagnostics. Clean or replace sensor. Mea- | |
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| The furnace flame is going off during a heating | sure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat | |
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| cycle. | call ends successfully. | |
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274 | Critical | (Furnace) The furnace limit switch has been | The system will go into Watchguard mode. Check firing rate and air flow. Check for blockage. The | |
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| open for more than 3 minutes. | alarm/fault will clear when a heat call ends successfully. | |
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table continued on next page
Page 49 | icomfort |
