9. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | ||
10. | Consider this fault like a Fault Code 13 and go to page number indicated in Index for Fault Code | Ð | Ð | INDEX | ||
13. |
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11. | Do you have 24v between terminals | 13 | 12 | Ð | ||
12. | Replace furnace control board. | Ð | Ð | 9 | ||
13. | Do you have 24v between terminals | 12 | 15 | Ð | ||
14. | You have an open RED wire or bad terminal in limit circuit. Repair or replace it. | Ð | Ð | 9 | ||
15. | Turn power off. | Ð | Ð | 16 | ||
16. | Do you have continuity across limit switch LS? | 20 | 17 | Ð | ||
17. | Wait for unit to cool then recheck for continuity across limit switch LS. | Ð | Ð | 18 | ||
18. | Do you have continuity across limit switch LS? | 20 | 19 | Ð | ||
19. | Replace limit switch. | Ð | Ð | 9 | ||
20. | Do you have continuity across flame rollout switch FRS? | 28 | 21 | Ð | ||
21. | Can flame rollout switch FRS be reset? | 23 | 22 | Ð | ||
22. | Replace flame rollout switch. | Ð | Ð | 9 | ||
23. | Reset flame rollout switch FRS, turn power on, and observe furnace operation for (2) 15 minute | Ð | Ð | 24 | ||
cycles. | ||||||
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24. | Does flame rollout switch trip again? | 26 | 25 | Ð | ||
25. | Does a different fault occur? | 8 | 9 | Ð | ||
| You have inadequate |
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| · | Reversed vent and |
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26. | · | Poor burner, manifold, or orifice alignment. | Ð | Ð | 27 | |
· Leak somewhere between primary and secondary heat exchangers. | ||||||
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| · | Leak in secondary heat exchanger. |
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| · | Internal restriction in coupling box or secondary heat exchanger. |
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27. | Fix problem. | Ð | Ð | 9 | ||
28. | Do you have continuity across auxiliary limit switch ALS? | 14 | 29 | Ð | ||
29. | Can auxiliary limit switch ALS be reset? | 31 | 30 | Ð | ||
30. | Replace auxiliary limit switch. | Ð | Ð | 9 | ||
31. | Reset auxiliary limit switch ALS, replace blower access panel, turn power on, set thermostat to call | Ð | Ð | 32 | ||
for heat or jumper R and W/W1 thermostat terminals, and observe furnace operation for 15 minutes. | ||||||
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32. | Does fault occur again? | 38 | 33 | Ð | ||
33. | Does a different fault occur? | 8 | 34 | Ð | ||
34. | Is this unit in downflow or horizontal position? | 35 | 9 | Ð | ||
35. | Disconnect R thermostat lead, wait for blower to stop, and continue to observe unit for 5 more min- | Ð | Ð | 36 | ||
utes. |
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36. | Does fault occur after blower stops? | 37 | 9 | Ð | ||
37. | Increase blower off delay time to 225 sec by putting both setup switches | Ð | Ð | 27 | ||
position. | ||||||
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38. | Does furnace have proper limit switch, limit shield, blower baffle (if used), rear air baffle (if used), | 39 | 27 | Ð | ||
and auxiliary limit switch? If so, are limit switch, limit shield, and heat exchangers properly aligned? | ||||||
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39. | Change limit switch first. If problem still exists, replace auxiliary limit switch. One of these switches | Ð | Ð | 9 | ||
is out of calibration. | ||||||
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40. | Does fault occur during low fire? | 41 | 42 | Ð | ||
| On the third burner cycle, unit will run in |
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41. | · | If unit has a bypass humidifier, make sure setup switch | Ð | Ð | 10 | |
· | If unit is installed in a zone system, make sure setup switch | |||||
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| · | Check |
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| Verify the following before going to Step 10: |
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42. | · If unit is installed in a zone system, make sure setup switch | Ð | Ð | 10 | ||
· Check | ||||||
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