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| Symptoms of Abnormal Operation |
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| Diagnostic/Status |
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| ComfortNet™ |
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| Fault Description |
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| Thermostat Only |
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| Possible Causes |
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| Corrective Actions |
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| Notes & Cautions |
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| (Legacy & ComfortNet™ Thermostat) |
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| LED Codes |
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| Message | Code |
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| ξ | Circulator blower runs continuously. No |
| E3 | ξ | Primary limit or |
| HIGH | E3 | ξ | Insufficient conditioned air over | ξ | Check filters and ductwork for | ξ | Turn power OFF prior to | |||||||
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| furnace operation. |
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| auxiliary limit circuit is |
| LIMIT |
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| the heat exchanger. Blocked |
| blockage. Clean filters or |
| repair. | |||||||
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| ξ Integrated control module LED display |
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| open. |
| OPEN |
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| filters, restrictive ductwork, |
| remove obstruction. | ξ | See Specification Sheet | ||||||
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| provides E3 error code. |
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| ξ Rollout limit circuit is |
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| improper circulator blower speed, | ξ | Check circulator blower speed |
| applicable to your model | ||||||
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| ξ ComfortNet™ thermostat “Call for |
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| open. |
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| or failed circulator blower motor. |
| and performance. Correct speed |
| for allowable rise range | ||||||
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| Service” icon illuminated. |
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| ξ | Flame rollout. |
| or replace blower motor if |
| and proper circulator | ||||
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| ξ ComfortNet™ thermostat scrolls “Check |
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| ξ Misaligned burners, blocked flue |
| necessary. |
| speed. | ||||||
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| Furnace” message. |
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| and/or air inlet pipe, or failed | ξ | Check burners for proper | ξ | See "Vent/Flue Pipe" | ||||
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| induced draft blower. |
| alignment. |
| section for piping details. | |||
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| ξ | Loose or improperly connected | ξ | Check flue and air inlet piping |
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| wiring. |
| for blockage, proper length, |
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| elbows, and termination. Correct |
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| as necessary. |
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| ξ | Check induced draft blower for |
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| proper performance. Replace if |
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| necessary. |
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| ξ | Tighten or correct wiring |
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| connection. |
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| ξ | Induced draft blower and circulator blower |
| E4 | ξ Flame sensed with no |
| IMPROPER | E4 | ξ | Short to ground in flame sense | ξ | Correct short at flame sensor or | ξ | Turn power OFF prior to | ||||||||
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| runs continuously. No furnace operation. |
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| call for heat. |
| FLAME |
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| circuit. |
| in flame sensor wiring. |
| repair. | |||||||
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| ξ Integrated control module LED display |
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| ξ | Lingering burner flame. | ξ | Check for lingering flame. |
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| provides E4 error code. |
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| ξ | Slow closing gas valve. | ξ | Verify proper operation of gas |
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| ξ ComfortNet™ thermostat “Call for |
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| valve. |
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| Service” icon illuminated. |
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| ξ ComfortNet™ thermostat scrolls “Check |
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| Furnace” message. |
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| ξ | No furnace operation. |
| E5 | ξ | Open Fuse |
| Not | Not | ξ | Short in low voltage wiring | ξ | Locate and correct short in low | ξ | Turn power OFF prior to | |||||||
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| ξ Integrated control module LED display |
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| Displayed | Displayed |
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| voltage wiring |
| repair. | |||||||
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| provides E5 error code. |
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| ξ Replace fuse with | |||
| ξ | ComfortNet™ thermostat displays |
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| automotive type | |||
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| “Battery Power”. |
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| ξ | Normal furnace operation. |
| E6 | ξ Flame sense micro amp |
| WEAK | E6 | ξ | Flame sensor is coated/oxidized. | ξ | Sand flame sensor if | ξ | Turn power OFF prior to | ||||||||
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| ξ Integrated control module LED display |
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| signal is low |
| FLAME |
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| ξ | Flame sensor incorrectly |
| coated/oxidized. |
| repair. | ||||||||
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| provides E6 error code. |
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| positioned in burner flame. | ξ | Inspect for proper sensor | ξ Sand flame sensor with | |||||
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| ξ Lazy burner flame due to |
| alignment. |
| emery cloth. | ||||
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| improper gas pressure or | ξ | Check inlet air piping for | ξ | See "Vent/Flue Pipe" | |||
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| combustion air. |
| blockage, proper length, elbows, |
| section for piping details. | |||
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| and termination. | ξ See rating plate for proper | |||
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| ξ | Compare current gas pressure to |
| gas pressure. | ||
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| rating plate. Adjust as needed. |
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| ξ Furnace fails to operate. |
| E7 | ξ | Problem with igniter |
| IGNITER | E7 | ξ | Improperly connected igniter. | ξ | Check and correct wiring from | ξ | Turn power OFF prior to | ||||||||
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| ξ Integrated control module LED display |
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| circuit. |
| FAULT |
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| ξ | Shorted igniter. |
| integrated control module to |
| repair. | ||||||||
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| provides E7 error code. |
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| ξ | Poor unit ground. |
| igniter. | ξ | Replace igniter with | ||||
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| ξ ComfortNet™ thermostat “Call for |
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| ξ | Igniter relay fault on integrated | ξ | Replace shorted igniter. |
| correct replacement part. | |||||
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| Service” icon illuminated. |
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| control module. | ξ | Check and correct unit ground | ξ | Replace control with | ||||
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| ξ ComfortNet™ thermostat scrolls “Check |
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| wiring. |
| correct replacement part. | ||||
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| Furnace” message. |
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| ξ | Check igniter output from |
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| control. Replace if necessary. |
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TROUBLESHOOTING CHART
