Troubleshooting (continued)
IQ Boiler Control Status Codes (when "Err" is not displayed) - continued
Display | Status | Boiler / Control Action(s) |
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20Damper Failed The damper end switch has not closed (damper end switch is open) at the beginning of
Open the heat cycle. An alarm message is sent but the control is not in lockout.
21 | Damper Failed | The damper end switch has not opened (damper end switch is closed) at the | |
Closed | beginning of the heat cycle. An alarm message is sent but the control is not in lockout. | ||
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If "Err" IS displayed on the IQ Boiler Control: "Err" flashes on the IQ Boiler control display followed by a number. Use the following table along with this error number to determine the problem and possible causes:
IQ Boiler Control Error Codes (when "Err" is flashing)
Display | Status | Boiler / Control Action(s) | ||
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Blank | Boiler and Circulator off | No 120 Vac power at boiler, check breaker and wiring between breaker panel and boiler. | ||
Err |
| 4 | Flame Current Lower | Check pilot assembly. |
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| than Threshold | |||
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Err |
| 6 | Flame Sensed Out of | Flame sensed out of normal sequence (before opening gas valve or after closing gas |
| Normal Sequence | valve). | ||
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Err |
| 18 | Electronics Failure | Replace Control . |
Err |
| 24 | Flame Sensed During | Flame sensed during |
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Err |
| 32 | Temperature Sensor | Temperature sensor or interface failure (open or short connection, increased connection |
| Failure | resistance, dual sensor mismatch) or control hardware failure. | ||
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Err |
| 55 | Damper Failed | Atmospheric Damper End Switch failed to close (end switch contacts stuck open). |
| to Open | |||
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Err |
| 56 | Damper Failed to Close | Atmospheric Damper End Switch failed to open (end switch contacts stuck closed). |
Err |
| 57 | Flame Rod Shorted to | Flame Rod shorted to burner ground, this can result from excessive flue gas |
| Burner Ground | condensation. | ||
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Err |
| 58 | AC Line Frequency Error | AC Signal is too noisy or frequency is incorrect. |
Err |
| 59 | Line Voltage Error | AC voltage out of specification high or low. |
Err |
| 60 | Thermostat Input Higher | Check thermostat wiring. |
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| than Threshold |
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Err |
| 61 | Line Voltage Unstable | Possibly too many heavy loads switching on and off cause erratic supply voltage. |
Err |
| 63 | Soft Lockout - Maximum | Maximum number of recycles exceeded. |
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| Recycles Exceeded |
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Err |
| 64 | Soft Lockout - Internal | Caused by general electronics failure such as relay open or shorted contacts, flame |
| Failure | sensing circuit error, or A to D error. | ||
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