Fault Code 11
NO FAULT IN RECENT HISTORY DISPLAYÐThis indicates 1 of the following:
·No faults have occurred in the last 5 previous cycles and setup switch
·The fault history can be cleared by jumpering R, W/W1, and Y/Y2 thermostat leads simultaneously while setup switch
·Component test was successfully completed and setup switch
STEP | ACTION | YES | NO | GO TO | |
1. | Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | 2 | |
2. | Is setup switch | 3 | 5 | Ð | |
3. | Put setup switch | Ð | Ð | 4 | |
4. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
5. | Is setup switch | 6 | 7 | Ð | |
6. | Put setup switch | Ð | Ð | 4 | |
7. | Jiggle setup switches | Ð | Ð | 4 | |
furnace control board. | |||||
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Fault Code 12
BLOWER CALIBRATION LOCKOUTÐThis fault indicates that blower motor speed calculated for low heat is either less than 250 RPM or greater than 1300 RPM on 2 successive attempts at calibration. Control will
STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off, wait 30 sec, and then restore power. Reset thermostat. Observe operation of fur- |
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nace through 1 heating cycle. | Ð | Ð | 2 | ||
| NOTE: Blower access panel must be in place. |
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2. | Does only Fault Code 44 flash? | 40 | 6 | Ð | |
3. | The problem is excessive restriction in the air delivery system. Check filters and ductwork. Use Ap- | Ð | Ð | 4 | |
pendix E to evaluate. | |||||
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4. | Fix problem. | Ð | Ð | 5 | |
5. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
6. | Does Fault Code 44 flash twice followed by Fault Code 41? | 9 | 7 | Ð | |
7. | Does a different fault occur? | 8 | 39 | Ð | |
8. | Go to page number indicated in Index for fault code flashed. | Ð | Ð | INDEX | |
9. | Turn power off and remove blower access panel. | Ð | Ð | 10 | |
10. | Are all pins and wire leads intact on connectors between furnace control board and blower motor. | 11 | 4 | Ð | |
11. | Depress door switch. Use a piece of tape to hold switch closed. Wait a few sec for self test before | Ð | Ð | 12 | |
proceeding to next step. | |||||
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12. | Disconnect all thermostat leads from furnace control board and jumper R and W/W1 thermostat ter- | Ð | Ð | 13 | |
minals. | |||||
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13. | Does blower motor turn on and come up to speed | Ð | 20 | Ð | |
14. | Disconnect jumper wire across R and W/W1 thermostat terminals, turn power off, and then restore | Ð | Ð | 15 | |
power. Wait a few sec for self test before proceeding to next step. | |||||
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| Check RPM feedback line. To do this, connect a DC voltmeter across terminals |
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| and |
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15. | voltage across ORANGE and VIOLET wires change between states as shown below? | 16 | 17 | Ð | |
· State 1ÐOFF (12.0Ð12.5 vdc) | |||||
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| · State 2ÐLOW (10.7Ð11.7 vdc) |
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| · State 3ÐHIGH(9.7Ð10.7 vdc) |
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16. | Replace furnace control board. | Ð | Ð | 5 | |
17. | Connect a DC voltmeter across ORANGE (+) and VIOLET |
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the COMPONENT TEST by turning setup switch | 18 | 19 | Ð | ||
| proximately the same DC voltages across ORANGE and VIOLET wires that you saw in Step 15? |
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→18. | Replace entire blower motor or blower control module attached to the blower motor. If you replace |
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the blower control module go to step 44. Always inspect failed motor for water damage. If present, | Ð | Ð | 4 | ||
| find source of water and fix. Check |
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