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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34 | Critical | (Stat) The thermostat does not know the capac- | [Indicated unit] is missing the programmed unit capacity. Go to [Indicated unit] and program the unit | |
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| ity (tonnage) of the (furnace, air−handler or out- | capacity manually. See the unit IOM for programming instructions. Remove power to thermostat | |
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| door unit). Please program the correct capacity | before programming the unit control board. Once programming is complete, reconnect thermostat | |
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| of the (furnace, air−handler or outdoor unit). | wires and reconfigure system. | |
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36 | Critical | (Stat) The system has been heating for at least | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for | |
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| 15 minutes, without a demand for heating. | other alarms/codes that may be preventing the system from operating as expected. | |
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| Step 1: Check all heating equipment to determine cause of heating demand. | |
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| Step 2: Recycle power. | |
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| System will clear code when it detects condition has cleared. | |
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37 | Critical | (Stat) The system has been cooling for at least | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for | |
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| 15 minutes, without a demand for cooling. | other alarms/codes that may be preventing the system from operating as expected. | |
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| Step 1: Check all cooling equipment to determine cause of cooling demand. | |
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| Step 2: Recycle power. | |
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| System will clear code when it detects condition has cleared. | |
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38 | Critical | (Stat) The system has not been able to turn on | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for | |
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| the heating for more than 45 minutes. The sys- | other alarms/codes that may be preventing the system from operating as expected. | |
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| tem will go offline for 60 minutes and try again. | Step 1: Check all heating equipment to determine cause. | |
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| Step 2: Recycle power. | |
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| System will clear code when it detects condition has cleared. | |
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39 | Critical | (Stat) The system has not been able to turn on | Run the system in diagnostic mode and verify that it matches actual equipment operation. Check for | |
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| the cooling for more than 45 minutes. The sys- | other alarms/codes that may be preventing the system from operating as expected. | |
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| tem will go offline for 60 minutes and try again. | Step 1: Check all cooling equipment to determine cause. | |
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| Step 2: Recycle power. | |
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| System will clear code when it detects condition has cleared. | |
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105 | Critical | (Stat / Furnace / Air Handler / Outdoor Unit) The | Equipment is unable to communicate. This may indicate the existence of other alarms/codes. In | |
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| (stat, furnace, air−handler or outdoor unit) has | most cases errors are related to electrical noise. Make sure high voltage power is separated from | |
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| lost communication with the rest of the system. | RSBus. Check for mis−wired and/or loose connections between the stat, indoor unit and outdoor unit. | |
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| Check for a high voltage source of noise close to the system. Generally, this is a self−recoverable | |
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| error. | |
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110 | Critical | (Furnace) The line voltage is too low. | This alarm/code may appear during a brownout. Line voltage is below its designed operating value. | |
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| Check and correct the power line voltage. | |
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111 | Critical | (Furnace) The line power voltage wiring is re- | The unit is reporting that its power line and neutral are reversed. Turn off the power to the system and | |
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| versed. | correct the line power voltage wiring. System resumes normal operation 5 seconds after fault recov- | |
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| ered. | |
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112 | Critical | (Furnace) The reporting device cannot find | Provide proper earth ground to the equipment. System resumes normal operation 5 seconds after | |
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| earth ground. The thermostat will shut down the | fault recovered. | |
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| system. |
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| table continued on next page | |
506920−01 09/12 | Page 46 |
