Integrated Control Diagnostic Codes (continued)
Code | Diagnostic Codes/Status of Equipment | Action Required to Clear and Recover |
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E 105 | Device communication problem − No other devices on RS BUS (Commu- | Equipment is unable to communicate. Indicates |
| nication | numerous message errors. In most cases errors are |
| system). | related to electrical noise. Make sure high voltage |
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| power is separated from RSBus. Check for mis− |
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| wired and/or loose connections between the stat, |
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| indoor unit and outdoor unit. Check for a high volt- |
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| age source of noise close to the system. Fault |
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| clears after communication is restored. |
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E 110 | Low line voltage. | Line Voltage Low (Voltage lower than nameplate |
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| rating). Check power line voltage and correct. Alarm |
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| clears 5 seconds after fault recovered. |
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E 111 | Line voltage polarity reversed. | Reverse line power voltage wiring. System resumes |
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| normal operation 5 seconds after fault recovered. |
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E 112 | Ground not detected | System shuts down. Provide proper earth ground. |
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| System resumes normal operation 5 seconds after |
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| fault recovered. |
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E 113 | High line voltage. | Line Voltage High (Voltage higher than nameplate |
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| rating). Provide power voltage within proper range. |
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| System resumes normal operation 5 seconds after |
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| fault recovered. |
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E 114 | Line voltage frequency out−of−range. | No 60 Hertz Power. Check voltage and line power |
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| frequency. Correct voltage and frequency problems. |
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| System resumes normal operation 5 seconds after |
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| fault recovered. |
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E 115 | Low 24V − Control will restart if the error recovers. | 24−Volt Power Low (Range is 18 to 30 volts). Check |
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| and correct voltage. Check for additional power−rob- |
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| bing equipment connected to system. May require |
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| installation of larger VA transformer to be installed in |
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| furnace / air handler. Clears after fault recovered. |
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E 116 | High 24V. | 24 Volt Power High (Range is 18 to 30 volts). Check |
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| and correct voltage. Check for proper line voltage |
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| (120V, 240V, etc.) to equipment. Clears when con- |
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| trol senses proper voltage. |
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E 117 | Poor ground detected (Warning only) | Provide proper grounding for unit. Check for proper |
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| earth ground to the system. Warning only will clear |
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| 30 seconds after fault recovered. |
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E 120 | Unresponsive device. Communication only. | Usually caused by delay in outdoor unit responding |
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| to indoor unit poling. Recycle power. Check all wir- |
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| ing connections. Cleared after unresponsive device |
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| responds to any inquiry. |
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E 124 | Active communicating thermostat signal missing for more than 3 min- | Equipment lost communication with the thermostat. |
| utes. | Check four wiring connections, ohm wires and cycle |
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| power at the thermostat. Alert stops all services and |
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| waits for heartbeat message from thermostat (sub- |
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| net controller). Cleared after valid thermostat (sub- |
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| net controller) message is received. |
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E 125 | Control failed self−check, internal error, failed hardware. Will restart if | Hardware problem on the control. Cycle power on |
| error | control. Replace if problem prevents service and is |
| recovers. Integrated control not communicating. Covers hardware errors | persistent. Critical alert. Cleared 300 seconds after |
| (flame sense circuit faults, pin shorts, etc.). | fault recovered. |
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E 126 | Control internal communication problem. | Hardware problem on the control. Cycle power on |
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| control. Replace if problem prevents service and is |
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| persistent. Cleared 300 seconds after fault recov- |
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| ered. |
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