START HEREÐIf a problem exists, the service technician should always begin troubleshooting here.
STEP | ACTION | YES | NO | GO TO | |
1. | Remove furnace door first. DO NOT REMOVE BLOWER ACCESS PANEL! Record status of LED's | Ð | Ð | 2 | |
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2. | Are any LEDs flashing? | 5 | 3 | Ð | |
3. | Are any LEDs on solid? (Solid means ON continuously.) | 4 | 8 | Ð | |
4. | Go to page number indicated in Index for LEDs 1, 2, 3, or 4 ON SOLID. | Ð | Ð | INDEX | |
5. | Is RED LED2 flashing? | 6 | 7 | Ð | |
6. | Go to page number indicated in Index for RED LED2 FLASHING. | Ð | Ð | INDEX | |
7. | Go to page number indicated in Index for subsection covering fault code being flashed. | Ð | Ð | INDEX | |
8. | Is power on? (DO NOT cycle power to unit). | 10 | 9 | Ð | |
9. | Turn power on. | Ð | Ð | 20 | |
10. | Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | 11 | |
Wait a few sec for self test before proceeding to next step. | |||||
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11. | Does problem appear to be low cooling airflow? | 12 | 13 | Ð | |
12. | Go to page number indicated in Index for subsection covering NOT ENOUGH COOLING AIRFLOW. | Ð | Ð | INDEX | |
13. | Make sure thermostat is calling for heat. | Ð | Ð | 14 | |
14. | Make sure thermostat fan control is in AUTO position if equipped. | Ð | Ð | 15 | |
15. | Observe operation of furnace for 20 minutes or until fault occurs. | Ð | Ð | 16 | |
16. | Does a fault occur? | 7 | 17 | Ð | |
17. | Is temperature rise below range specified on rating plate when unit is running in high fire? | 18 | 19 | Ð | |
18. | Go to page number indicated in Index for subsection | Ð | Ð | INDEX | |
covering HIGH FIRE TEMPERATURE RISE TOO LOW (COLD BLOW). | |||||
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19. | Does furnace operate properly? | 31 | 28 | Ð | |
20. | Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | 21 | |
Wait a few sec for self test before proceeding to next step. | |||||
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21. | Disconnect R thermostat lead, then wait until blower motor stops. | Ð | Ð | 22 | |
22. | Are any LEDs flashing? | 24 | 23 | Ð | |
23. | Are any LEDs on solid? (Solid means ON continuously.) | 4 | 25 | Ð | |
24. | Is RED LED2 flashing? | 6 | 7 | Ð | |
25. | Put setup switch | Ð | Ð | 26 | |
| Record fault codes listed in fault history. |
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26. | NOTE: Read fault codes until they repeat. The last fault code that occurred will flash first fol- | Ð | Ð | 27 | |
| lowed by the lowest number fault code. (EXAMPLE: 13, 13, 44) |
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27. | Are LEDs 3 and 4 flashing a Fault Code 11? | 29 | 30 | Ð | |
28. | Go to page number indicated in Index for subsection covering NO OPERATION WITH NO FLASH- | Ð | Ð | INDEX | |
ING FAULT CODE. | |||||
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29. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
30. | Go to page number indicated in Index for subsection covering first fault code flashed. | Ð | Ð | INDEX | |
31. | Disconnect the R thermostat lead, then wait until blower motor stops. | Ð | Ð | 32 | |
32. | Put setup switch | Ð | Ð | 33 | |
| Record fault codes listed in fault history. |
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33. | NOTE: Read fault codes until they repeat. The last fault code that occurred will flash first fol- | Ð | Ð | 34 | |
| lowed by the lowest number fault code. (EXAMPLE: 13, 13, 44) |
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34. | Are LEDs 3 and 4 flashing a Fault Code 11? | 35 | 30 | Ð | |
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35. | Go to page number indicated in Index for the CLEANUP AND |
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problem persists on an intermittent basis, replace furnace control board. If problem still persists on | Ð | Ð | INDEX | ||
| an intermittent basis after replacing furnace control board, contact your distributor. |
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