| Alert Codes | Priority-Alert Text-Steps to Clear |
|---|---|
| 180 | Critical. (Furnace / Air Handler / Outdoor Unit) The thermostat has found a problem with the (furnace, airhandler or outdoor unit) outdoor sensor. In normal operation after control recognizes sensors, the alarm will be sent if valid temperature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or airhandler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as 'installed' and shown in the 'About' screen. The alarm/fault will clear upon configuration, or sensing normal values. |
| 200 | Critical. (Furnace) The furnace roll out limit switch is open. Correct the cause of roll out trip. Reset roll out switch. Reset power to clear. Test the furnace operation. The alarm/fault clears after the furnace roll out switch is closed. |
| 201 | Critical. (Furnace / Air Handler) The system has lost communication with the (furnace or airhandler) indoor blower motor. Lost communication with indoor blower motor. Possible causes include: power outage, brownout, motor not powered, loose wiring, condensation on air handler control without cover on breaker. Problem may be on control or motor side. Cleared after communication is restored. |
| 202 | Critical. (Furnace / Air Handler) The unit size code for the (furnace or airhandler) and the size of blower motor do not match. Incorrect appliance unit size code selected. Check for proper configuring under Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming. |
| 203 | Critical. (Furnace / Air Handler) The unit size code for the (furnace or airhandler) has not been selected. No appliance unit size code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Critical Alert. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming. |
| 204 | Critical. (Furnace) There is a problem with the furnace gas valve. Check gas valve operation and wiring. The alarm/fault clears after the issue is corrected. |
| 205 | Critical. (Furnace) The furnace gas valve relay contact is closed. Check wiring on control and gas valve. The alarm/fault clears after the issue is corrected. |
| 206 | Critical. (Furnace) The furnace gas valve 2nd stage relay is faulty. Furnace will operate on 1st stage for the remainder of the heating demand. The alarm/fault will clear after the issue is corrected. If unable to operate 2nd stage, replace control. |
| 207 | Critical. (Furnace) The furnace hot surface igniter is open. Measure the resistance of hot surface igniter. Replace the it if it is not within the specified range found in IOM. The alarm/fault clears after the issue is corrected. |
| 223 | Critical. (Furnace) The furnace low pressure switch is open. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
| 224 | Critical. (Furnace) The furnace low pressure switch is stuck closed. Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a heat call . Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
| 225 | Critical. (Furnace) The furnace high pressure switch is failing to close. Check pressure (inches w.c.) of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
| 226 | Critical. (Furnace) The furnace high pressure switch is stuck closed. Check operation of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
| 227 | Moderate. (Furnace) The furnace low pressure switch is open in run mode. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected. |
| 228 | Moderate. (Furnace) The furnace control is not able to calibrate the pressure switch. Unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a successful calibration. |
| 229 | Minor. (Furnace) The furnace control has switched to high fire ignition because the low fire pressure switch did not close in the allowed time. IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. No action is needed. |
| 240 | Moderate. (Furnace) The furnace flame current is low. Check microamperes of the flame sensor using thermostat diagnostics. Clean or replace the flame sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm clears after a proper microamp reading has been sensed. |
| 241 | Critical. (Furnace) The furnace flame is going out while the furnace is heating. Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault will clear when a heat call ends successfully. |
| 250 | Moderate. (Furnace) The furnace primary limit switch is open. Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the duct work. Check for proper air flow. If limit switch is not closed within 3 minutes, the unit will go into 1hour Watchguard mode. The alarm/fault will clear when a heat call ends successfully. |
| 252 | Moderate. (Furnace) The furnace discharge airtemperature is high. Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will clear when a heat call ends successfully. |
| 270 | Critical. (Furnace) The furnace is in Watchguard mode. The furnace igniter cannot turn on the flame. Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor current. Check for dirty filters. The alarm/fault will clear on successful ignition. |
| 271 | Critical. (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear on successful ignition. |
| 272 | Critical. (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open during run mode. Check operation of low pressure switch to see if it is stuck open during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear when a heat call ends successfully. |
| 273 | Critical. (Furnace) The furnace is in Watchguard mode. The furnace flame is going off during a heating cycle. Check microamperes of flame sensor using thermostat diagnostics. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat call ends successfully. |
| 274 | Critical. (Furnace) The furnace limit switch has been open for more than 3 minutes. The system will go into Watchguard mode. Check firing rate and air flow. Check for blockage. The alarm/fault will clear when a heat call ends successfully. |
| 275 | Critical. (Furnace) The furnace flame is out of sequence. The system will go into Watchguard mode. Shut off gas. Check for gas valve leak. The alarm/fault will clear on next successful ignition. |
| 276 | Critical. (Furnace) The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. The system will go into Watchguard mode. Check vent system and pressure switch wiring connections. The fault/alarm will clear when the furnace calibrates itself successfully. |
| 290 | Critical. (Furnace) There is a problem with the furnace ignition circuit. The system will go into Watchguard mode. Measure resistance of hot surface igniter. Replace the hot surface ignitor it is not within specifications. The alarm/fault will clear on next successful ignition. |
| 291 | Critical. (Furnace) The heating airflow is below the minimum required level. The system will go into Watchguard mode. Check for dirty filters and other air flow restrictions. Check blower performance. The alarm/fault will clear when a heat call ends successfully. |
| 292 | Critical. (Furnace / Air Handler) The (furnace or airhandler) indoor blower motor will not start. The system will go into Watchguard mode. Indoor blower motor unable to start. This could be due to seized bearing, stuck wheel, obstruction etc. Replace motor or wheel if assembly does not operate or meet performance standards. The alarm/fault clears after the indoor blower motor starts successfully. |
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