U-2 Diagnostics Board
The
The
The
additional light indicates that the diagnostics board is energized and is currently monitoring for safety faults. (In order to prevent spurious alarm conditions, the
Once a fault has been detected, the
WARNING: Only qualified persons shall attempt to repair the boiler. Improper adjustment, service or maintenance may damage the equipment, create a hazard resulting in asphyxiation, explosion, fire, electric shock, personal injury or property damage, and will void the warranty.
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Light | Color | Indication |
System Enabled | Yellow | |
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Manual High Limit | Red | Water temperature is over the manual high limit setting. |
Auto High Limit | Red | Water temperature is over the auto high limit setting. |
Flow Switch | Red | Water flow rate is too low. |
Low Water | Red | Insufficient water volume for boiler operation. |
High/Low Gas Pressure | Red | Gas supply pressure is below or above the allowed minimum gas supply |
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| pressure to ensure safe operation. |
Burner High Limit | Red | Mixer or PVC vent pipe, if installed, is over heated. |
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Blower/Ignition Lockout | Red | Blower failure, not enough combustion air or the equipment has an ignition |
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Blocked Vent | Red | The vent pressure switch has detected a blocked vent. |
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Table T:
43