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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407 | Critical | (Outdoor Unit) The required amount of current is | Required amount of current is not passing through Run current transformer. Clears the error after | |
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| not passing through run current transformer. | current is sensed in RUN sensor, or 1 normal compressor run cycle, or after power reset | |
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408 | Critical | (Outdoor Unit) The compressor is running con- | Compressor runs continuously. Clears the error after 1 normal compressor run | |
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| tinuously. | cycle or after power reset. | |
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409 | Moderate | (Furnace / Air Handler / Outdoor Unit) The sec- | Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued. | |
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| ondary voltage for the (furnace, air−handler or | Clears the code after voltage is higher than 20 VAC for 2 seconds or after power | |
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| outdoor unit) has fallen below 18VAC. If this | reset. | |
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| continues for 10 minutes, the thermostat will |
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| turn off the (furnace, air−handler or outdoor unit). |
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410 | Moderate | (Outdoor Unit) The outdoor unit pressure is be- | Unit pressures are below the lower limit. Pressure switch opens at 40 psig (system shuts down) and | |
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| low the required limit. | closes at 90 psig (system restarts). | |
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411 | Critical | (Outdoor Unit) The low pressure switch has | Open low pressure switch error count reached 5 strikes. Check system charge using approach and | |
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| opened 5 times during one cooling cycle. As a | sub cooling temperatures. Reset by putting outdoor unit control in test mode or resetting low voltage | |
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| result, the thermostat has shutdown the outdoor | power. | |
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| unit. |
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412 | Moderate | (Outdoor Unit) The outdoor unit pressure is | Unit pressure is above the upper limit. Pressure switch opens at 590 psig (system shuts down) and | |
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| above the required limit. The system will shut | closes at 418 psig (system restarts). | |
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| down. |
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413 | Critical | (Outdoor Unit) The high pressure switch has | Open high pressure switch error count reached 5 strikes. Check system charge | |
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| opened 5 times during one cooling cycle. As a | using approach and sub cooling temperatures. Check outdoor fan operation. Check for dirt or debris | |
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| result, the thermostat has shutdown the outdoor | blocking air flow to outdoor unit. Reset by putting outdoor unit control in test mode or resetting low | |
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| unit. | voltage power. | |
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414 | Critical | (Outdoor Unit) The discharge line temperature | Discharge line temperature is > 279ºF. Make sure coil is clean and airflow unobstructed in and out of | |
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| is higher than the recommended upper limit of | condenser. Check system operating pressures and compare to unit charging charts in installation | |
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| 279ºF. | manual. Clears after discharge temperature is < 225ºF. | |
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415 | Critical | (Outdoor Unit) The discharge line temperature | Discharge line high temperature error count reached 5 strikes. Make sure coil is clean and airflow | |
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| has been consistently higher than the recom- | unobstructed in and out of condenser. Check system charge using approach and sub cooling tem- | |
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| mended upper limit of 279ºF. | peratures. Reset by putting outdoor board in test mode or resetting low voltage power. | |
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416 | Critical | (Outdoor Unit) The outdoor coil sensor is either | Sensor being detected open or shorted, or temperature is out of sensor range. | |
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| open, short−circuited or the temperature is out of | Outdoor unit control will not perform demand or time/temperature defrost operation. (System will still | |
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| sensor range. As a result the outdoor unit con- | heat or cool.) Clears when outdoor unit control detects proper sensor readings. | |
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| trol will not perform any defrost tempering. |
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417 | Critical | (Outdoor Unit) The outdoor unit sensor is either | Outdoor unit control detects open or shorted sensor, or temperature that is out of sensor range. | |
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| open, short−circuited or the temperature is out of | Critical Alert after 10 minutes. Reset by replacing sensor. This fault is detected by allowing the unit to | |
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| sensor range. As a result the outdoor unit con- | run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range | |
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| trol will not perform any defrost tempering. | after 90 seconds, the board will count one fault. After 5 faults, the board will lock out. Check for | |
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| proper sensor reading and attachment to line. Replace if out−of−specifications. | |
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| table continued on next page | |
Page 53 | icomfort |
