Table 10B - Troubleshooting with LED Indicator Assistance for Honeywell Control Board
PATTERN | STATUS | CHECK/REPAIR |
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Short Flash | Control powered (without call for Heat) | Not Applicable |
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Heartbeat | Call for Heat: normal operations | Not Applicable |
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2 | Pressure Switch failed closed | 1. Check pressure switch to see if open to start, if not |
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| replace switch. |
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| 2. Air flow switch jumpered. Remove jumper and check |
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| operation. |
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3 | Pressure Switch failed open | 1. Look for obstruction or restrictions in appliance air |
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| intake or flue outlet that are preventing proper |
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| combustion airflow. |
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| 2. Moisture or debris in tube that connects pressure |
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| switch and draft inducer. |
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| 3. Check spud on power venter housing. Make sure it is |
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| clear. |
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4 | Limit circuit open | 1. Open manual reset rollout switch. |
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| 2. Gas pressure is too high, over fired condition. |
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| 3. Incorrect airflow due to blockage or fan motor not |
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| operating. |
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5 | Flame sensed out of sequence - flame still present | 1. Flame probe miswired or shorted. |
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6+1 | Softlockout: Failed to light in four ignition trials | 1. Gas supply off or gas pressure too low. |
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| 2. Flame sense rod contaminated or loose wire. |
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| 3. Gas valve switch is off or wires are not connected. |
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| 4. Broken or cracked porcelain on spark ignitor |
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| allowing spark to jump to ground and not between |
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| end of probes. |
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6+2 | Softlockout: Limit circuit opened during run | 1. Open manual reset rollout switch. |
| (recycle counter at its maximum) | 2. Gas pressure too high, over fired condition causing |
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| high limit to open. |
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| 3. Incorrect airflow due to blockage or fan motor not |
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| operating. |
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6+3 | Softlockout: Pressure Switch opened during run; did not | 1. Check pressure from drafter and see if it reads above |
| reclose within 2 seconds (flame lost and recycle at its | set point on pressure switch. Replace bad pressure |
| maximum) | switch. |
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6+4 | Softlockout: Flame failed during run | 1. Check sensor wire and make sure it is connected |
| (recycle at its maximum) | properly. |
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6+5 | Flame sensed while out of sequence and is now gone |
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7+1 | Lockout: Bad fuse detected. | 1. Check for short. If no short replace fuse and start unit. |
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| 2. If no short is found, check gas valve for possible over |
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| amp. condition. Replace gas valve. |
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7+2 | Lockout: Low voltage on 24VAC input | 1. Check transformer for proper voltage. Replace |
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| transformer if not correct. |
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7+4 | Lockout: Flame Rod shorted to ground or there is a big | 1. Switch off power and check flame rod wiring. |
| leakage from flame rod to ground |
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7+5 | Lockout: Gas Valve fault | 1. Turn unit off and back on. If fault code flashes again |
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| check gas valve for problem. If problem found replace |
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| gas valve. |
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7+6 | Lockout: Internal Hardware error detected | 1. Reset board. If code flashes again replace board. |
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