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R
e
Reason
The return temperature has exceeded the blocking temperature but not the lock-out
temperature.
Cause:
An external heat source (CHP, heat pump etc.) has heated the return temperature above the blocking temperature.
Corrective Action:
Reduce pre heat temperature of the external heat source.
Cause:
The external heating controls suddenly close causing excessive return water temperature.
Corrective Action:
Dampen the reaction time of the external heating control system to prevent sudden boiler temperature rise.
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F
l
Reason
The flue gas temperature has exceeded the blocking temperature.
Cause:
Heat exchanger polluted and not able to effectively transfer heat to the system water.
Corrective Action:
Check and clean the heat exchanger.
Cause:
Defective (partially shorted) flue gas sensor or sensor connection.
Corrective Action:
Check for moisture in the sensor connections or replace sensor.
Cause:
There is no water in the unit while firing.
Corrective Action:
Bleed all air from the unit so the heat from combustion can be transferred to the water and won't leave through the flue
Cause:
Heat exchanger failure.
Corrective Action:
Contact Lochinvar Limited for further guidance.
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A n
Reason
The controller received a new heat demand too soon after the last heat demand finished.
Cause:
System water temperature cooling and causing a heat demand within the anti-cycling time period.
Corrective Action:
Dampen external heating system controls to slow down the cooling time of the heating medium (water).
Increase system volume to act as a buffer between the boiler circuit and heating circuit.
Cause:
Rapid opening and closing of external thermostat
Corrective Action:
Check switching differential of on/off thermostat
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