41. | Make sure perforated disks are in | Ð | Ð | 42 |
42. | Check pressure tubing going to gas valve air pressure fitting for kinks. | Ð | Ð | 43 |
43. | Remove gas valve air pressure fitting and check gas valve for blockage. | Ð | Ð | 44 |
44. | Ensure vent and | Ð | Ð | 45 |
45. | Check burner orifice size and alignment. | Ð | Ð | 46 |
46. | Add restriction to | Ð | Ð | 12 |
47. | Jumper R and W2 thermostat terminals on furnace control board. | Ð | Ð | 48 |
48. | Do you have combustion oscillations in high fire? | 41 | 12 | Ð |
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Fault Code 41
BLOWER OUTSIDE VALID SPEED RANGEÐThis fault indicates 1 of the following:
·Blower motor speed cannot be maintained within 10% of calculated speed over a
·Blower motor speed is less than 250 RPM or greater than 1300 RPM for more than 10 sec.
STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off, remove blower access panel, and disconnect R thermostat lead from furnace con- | Ð | Ð | 2 | |
trol board. | |||||
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2. | Turn power on and depress door switch. Use a piece of tape to hold switch closed. | Ð | Ð | 3 | |
3. | Jumper R and W/W1 thermostat terminals on furnace control board. | Ð | Ð | 4 | |
4. | Observe operation of furnace for next 8 minutes or until fault occurs. | Ð | Ð | 5 | |
5. | Does Fault Code 44 flash twice followed by Fault Code 41? | 6 | 7 | Ð | |
6. | After about 10 minutes of operation, furnace will lock out and flash Fault Code 12. Go to page num- | Ð | Ð | INDEX | |
ber indicated in Index for Fault Code 12. | |||||
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7. | Does only Fault Code 41 flash? | 11 | 8 | Ð | |
8. | Does a different fault occur? | 9 | 25 | Ð | |
9. | Go to page number indicated in Index for fault code flashed. | Ð | Ð | INDEX | |
10. | Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS. | Ð | Ð | INDEX | |
11. | Does blower motor suddenly stop 10 sec before fault is signaled? | 12 | 21 | Ð | |
12. | Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals. | Ð | Ð | 13 | |
13. | Put setup switch | Ð | Ð | 14 | |
14. | Turn power on and wait several sec, then jumper R and W/W1 thermostat terminals on furnace con- | Ð | Ð | 15 | |
trol board. | |||||
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15. | Check connectors PL3, PL10, PL11, PL12, PL13, B1, and B2. | Ð | Ð | 16 | |
16. | Does motor operate intermittently in response to connectors and wires being moved? | 17 | 18 | Ð | |
17. | Fix problem. | Ð | Ð | 10 | |
18. | Does blower motor suddenly stop? | 19 | 20 | Ð | |
→19. | 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 26. If problem still persists on an intermittent basis after re- | Ð | Ð | INDEX | ||
| placing blower motor or blower control module, contact your distributor. |
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20. | Replace furnace control board. | Ð | Ð | 10 | |
21. | Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals. | Ð | Ð | 22 | |
22. | Check connectors PL3, PL10, and PL13 for possible intermittent connection of ORANGE and VIO- | Ð | Ð | 23 | |
LET wires. | |||||
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