Lochinvar EcoForce EF80 Installation, Commissioning, User And Maintenance Instructions page 106

23.1.2 Blocking codes
The display is not blinking, but is light up during the blocking period.
The water heater is blocking an action, because of an extraordinary situation. This action will be continued after eliminating the
extraordinary situation.
Display message
Reason:
Cause:
The water flow is restricted.
Corrective action:
Check functioning of the pump.
Check/open all valves that might restrict the water flow through the unit.
Check for an external system pump that influences the flow through the unit.
Check if the system resistance exceeds the spare capacity of the unit pump.
Display message
Reason
Cause:
Systems that pre-heats the water heater return temperature too much/high.
Corrective action:
Reduce pre heat temperature of external heat source.
Cause:
The need for heat in the system suddenly drops causing hot return water to the water heater.
Corrective action:
Dampen external heating system control to prevent sudden water heater temperature rise.
Display message
Reason
Cause:
Heat exchanger polluted and not able to transfer enough heat to the system water.
Corrective action:
Check and clean heat exchanger.
Cause:
Bad flue gas sensor or sensor connection (partly shorted.)
Corrective action:
The sensor is of the type NTC. This means that its resistance gets lower when the temperature rises. A partly
shorted sensor will drop resistance and therefore 'measure' a higher temperature.
Check for moist in the sensor connections or replace the sensor.
F l o w t e m p
Flow temperature has exceeded the blocking temperature, but it has not exceeded
the lock-out value.
R e t u r n
Return temperature has exceeded the blocking temperature, but it has not
exceeded the lock-out value.
F l u e t e m p
Flue gas temperature has exceeded the limit.
h i g h
9 9 9
t e m p h i
9 9 9
h i g h
9 9 9
, 5 h r s
g h
, 5 h r s
, 5 h r s
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