Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death.
→44. | Remove tape from door switch and turn power off at main disconnect. | Ð | Ð | 45 | |
→45. | Disconnect PL10 from blower assembly. | Ð | Ð | 46 | |
→46. | Remove control box assembly from blower shelf and position out of the way. | Ð | Ð | 47 | |
→47. | Remove blower assembly from furnace. | Ð | Ð | 48 | |
→48. | Disconnect both | Ð | Ð | 49 | |
sure to depress release latches on connectors or they may get damaged. | |||||
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→49. | Remove two | Ð | Ð | 50 | |
REMOVE TORX HEAD SCREWS located next to | |||||
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→50. | Carefully lift blower control module off blower motor. Depress latch on internal connector to discon- |
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nect blower control module from motor portion of blower motor. DO NOT PULL ON WIRES. GRIP | Ð | Ð | 51 | ||
| PLUG ONLY. |
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| When blower control module is completely detached from blower motor, verify with standard ohm- |
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| meter that the resistance from each motor lead in motor plug to unpainted motor end plate is |
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→51. | greater than 100k ohms. Then verify motor windings are not shorted or open by measuring resis- | Ð | Ð | 52 | |
tance between each combination of pins in motor plug (there are three different combinations, pin | |||||
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| pins. |
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→52. | Did the motor pass the resistance check? | 53 | 55 | Ð | |
→53. | Does blower wheel turn freely with blower control module removed? | 54 | 55 | Ð | |
→54. | Replace blower control module. Inspect failed blower control module for water damage. If present, | Ð | Ð | 5 | |
find source of water and fix. Check | |||||
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→55. | Replace entire blower motor including blower control module. Inspect blower control module for wa- | Ð | Ð | 5 | |
ter damage. If present, find source of water and fix. Check | |||||
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Fault Code 13
LIMIT SWITCH LOCKOUTÐThis fault indicates the limit switch has tripped 10 times in a row in high fire or 3 times in a row in low fire during a call for heat. Control will
NOTE: After 2
NOTE: Boards with date codes of 9506 or later will lock into
STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off and remove blower access panel. Disconnect all thermostat leads from furnace con- | Ð | Ð | 2 | |
trol board. | |||||
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2. | Depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | Ð | |
3. | Put setup switch | Ð | Ð | 4 | |
| Is a Fault Code 44 present in the fault history. |
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4. | NOTE: Read fault codes until they repeat. The last fault code that occurred will flash first fol- | 46 | 5 | Ð | |
| lowed by the lowest number fault code. (EXAMPLE: 13, 13, 44) |
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5. | Put setup switch | Ð | Ð | 42 | |
6. | Does furnace have proper limit switch, limit shield, blower baffle (if used), and rear air baffle (if | 10 | 48 | Ð | |
used)? If so are limit switch, limit shield, and heat exchangers properly aligned? | |||||
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7. | Replace limit switch. | Ð | Ð | 9 | |
8. | Replace furnace control board. | Ð | Ð | 9 | |
9. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
10. | Put setup switch | Ð | Ð | 11 | |
11. | Jumper R and W/W1 thermostat terminals on furnace control board. | Ð | Ð | 12 | |
12. | Is furnace considerably overfired (10% or more)? Clock input rate. Do not use manifold pressure | 13 | 14 | Ð | |
method unless using propane. | |||||
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13. | Ensure gas inlet pressure and burner orifices (natural or propane) are correct. Then adjust gas |
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valve to proper rate per Installation, | Ð | Ð | 9 | ||
| proper rate, replace gas valve. |
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14. | Is the personality connector PL5 properly wired per furnace model sizing chart in upper | 50 | 15 | Ð | |
corner of wiring schematic? | |||||
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15. | Replace or rewire personality connector. | Ð | Ð | 9 |
15