STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off and remove blower access panel. Make sure thermostat is NOT calling for heat. | Ð | Ð | 2 | |
2. | Depress door switch. Use a piece of tape to hold switch closed. Wait a few sec for self test before | Ð | Ð | 3 | |
proceeding to next step. | |||||
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3. | Set thermostat to call for heat or jumper R and W/W1 thermostat terminals. | Ð | Ð | 4 | |
4. | When GREEN LED4 is ON solid, clock | Ð | Ð | 5 | |
heat. On propane installations, check manifold pressure. | |||||
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5. | When YELLOW LED3 is ON solid, clock | Ð | Ð | 6 | |
pressure. | |||||
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6. | Is | 7 | 11 | Ð | |
7. | Do you have 24 vac across gas valve terminal HI and Com on furnace control board during high | 10 | 8 | Ð | |
fire? | |||||
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8. | You have an open wire or bad terminal on BROWN wire from furnace control board to gas valve | Ð | Ð | 9 | |
GV. Repair it or replace the harness. | |||||
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9. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
10. | Replace gas valve. | Ð | Ð | 9 | |
11. | Is | 13 | 12 | Ð | |
12. | Ensure gas inlet pressure and burner orifices are correct, then adjust gas valve to proper rate. If it | Ð | Ð | 9 | |
cannot be adjusted to proper rate, replace gas valve. | |||||
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13. | Check outdoor condensing unit for operation during heating cycle. | Ð | Ð | 14 | |
14. | Check temperature rise with blower door in place. Temperature rise should be |
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higher than midpoint of range stated on furnace rating plate. If return temperature is below 60°F, | Ð | Ð | 15 | ||
| condensation may form on heat exchangers. If left uncorrected, failure will result. |
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15. | Check | Ð | Ð | 9 | |
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LEDs 1, 2, 3, or 4 ON SOLID (SOLID means on continuously.)
·RED LED1 ON SOLID indicates furnace is operating in emergency heat.
·RED LED2 ON SOLID indicates microprocessor has malfunctioned or secondary voltage to furnace control board is low.
·YELLOW LED3 ON SOLID indicates furnace is operating in high fire.
·GREEN LED4 ON SOLID indicates furnace is operating in low fire.
STEP | ACTION | YES | NO | GO TO | |
1. | Turn power off and remove blower access panel. | Ð | Ð | 2 | |
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. | Is RED LED1 ON? | 5 | 9 | Ð | |
5. | Is setup switch | 6 | 7 | Ð | |
6. | Put setup switch | Ð | Ð | 8 | |
7. | Replace furnace control board. | Ð | Ð | 8 | |
8. | Go to page number indicated in Index for CLEANUP AND | Ð | Ð | INDEX | |
9. | Disconnect jumper wire across R and W/W1 thermostat terminals. | Ð | Ð | 10 | |
10. | Is RED LED2 ON? | 11 | 32 | Ð | |
11. | Do you have less than 17 vac between R and Com on furnace control board? | 12 | 19 | Ð | |
12. | Do you have less than 90 vac between P1 and P2 on furnace control board? | 13 | 15 | Ð | |
13. | Make sure wire gage between main fuse box and furnace complies with wire size specification in | Ð | Ð | 14 | |
Installation, | |||||
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14. | Fix problem. | Ð | Ð | 8 | |
15. | Disconnect R thermostat lead. | Ð | Ð | 16 | |
16. | Is RED LED2 ON? | 17 | 18 | Ð | |
17. | Replace transformer. | Ð | Ð | 8 | |
18. | Check thermostat wire gage between furnace and thermostat, and furnace and outdoor unit. It is |
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recommended that AWG No. 18 | Ð | Ð | 14 | ||
| ft. For wire lengths over 100 ft, use AWG No. 16 wire. |
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19. | Disconnect all thermostat leads from furnace control board. | Ð | Ð | 20 | |
20. | Put setup switch | Ð | Ð | 21 | |
21. | Does RED LED2 turn OFF? | 22 | 7 | Ð | |
22. | Put setup switch | Ð | Ð | 23 | |
23. | Turn power off and reconnect thermostat leads to furnace control board. | Ð | Ð | 24 | |
24. | Turn power on. | Ð | Ð | 25 | |
25. | Does RED LED2 turn back ON? | 26 | 36 | Ð | |
26. | Disconnect all thermostat leads from thermostat control board. | Ð | Ð | 27 | |
27. | Put setup switch | Ð | Ð | 28 | |
neously until RED LED2 turns OFF. | |||||
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