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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354 | Critical | (Air Handler) There is a problem with the air− | Heat section / Stage 4 failed (Same as Code 351). | |
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| handler’s 4th stage electric heat. Either the pilot |
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| relay contacts did not close, or the relay coil in |
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| the electric heat section did not energize. The |
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| air−handler will operate on 1st stage electric |
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| heat until the issue is resolved. |
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355 | Critical | (Air Handler) There is a problem with the air− | Heat section / Stage 5 failed (Same as Code 351). | |
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| handler’s 5th stage electric heat. Either the pilot |
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| relay contacts did not close, or the relay coil in |
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| the electric heat section did not energize. The |
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| air−handler will operate on 1st stage electric |
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| heat until the issue is resolved. |
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370 | Critical | (Furnace) The furnace control board has not | Control sees the loss of 24VAC for 2 minutes .Terminate all services and wait for interlock switch to | |
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| received 24VAC power for 2 minutes or more. | close. The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10 | |
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| seconds or on a power reset. If 2 stage with float switch, the IFC control R−DS is open. | |
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400 | Critical | (Outdoor Unit) The compressor internal over- | Thermostat demand Y1 is present; but, compressor is not running. Check power to unit. Clears the | |
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| load has tripped. | error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service | |
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| is removed, or after power reset. | |
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401 | Moderate | (Outdoor Unit) Either the compressor ran for | Compressor ran more than 18 hours to satisfy a single thermostat demand. Will not lockout system. | |
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| more than 18 hours continuously trying to cool | if 2 stage, units with blinking LED light controls, unit will run in low speed; units with 7−segment | |
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| the home or the refrigerant pressure in the sys- | display will display code, but continue to run in high speed. If a Heat Pump, and if outdoor temp is | |
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| tem is low. | less than 65 degrees, code is ignored. Clears the error after 30 consecutive normal run cycles or | |
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| power reset. Also monitors low pressure switch trips. | |
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402 | Critical | (Outdoor Unit) Either the discharge or suction | Discharge or suction pressure out−of−limits, or compressor overloaded. Clears the error after 4 con- | |
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| pressure level is out−of−limits, or the is compres- | secutive normal compressor run cycles. | |
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| sor overloaded. |
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403 | Moderate | (Outdoor Unit) The compressor ran for less than | Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the | |
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| 3 minutes to satisfy a thermostat demand. | error after 4 consecutive normal run cycles or power reset. | |
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404 | Critical | (Outdoor Unit) The compressor rotor is locked | Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refriger- | |
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| up. This could be due to a short circuiting of the | ant, etc. (NOTE: May need to install hard start kit). Clears the error after 4 consecutive normal run | |
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| run capacitor, seizing of the bearings or exces- | cycles or after power reset. | |
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| sive liquid refrigerant etc. |
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405 | Critical | (Outdoor Unit) The compressor circuit is open. | Compressor circuit open (due to power disconnection, open fuse, etc.) Clears the | |
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| This could be due to a power disconnection, | error after 1 normal compressor run cycle. | |
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| open fuse etc. |
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406 | Critical | (Outdoor Unit) The required amount of current is | Required amount of current is not passing through Start current transformer. Clears the error after | |
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| not passing through the start current transform- | current is sensed in START sensor, or after power reset. | |
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| er. |
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| table continued on next page | |
506920−01 09/12 | Page 52 |
