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F1
Reason:
Cause:
Systems that pre-heat the water heater return temperature too 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.
Corrective action:
Dampen external heating system control to prevent sudden water heater temperature rise.
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F2
Reason
Cause:
When the unit starts firing it expects to measure a temperature rise. If this temperature
rise is not detected, there is suspicion that there is no medium (water) present, to
transfer heat from combustion to the sensor.
The lack of water can cause this fault when the unit is firing.
Corrective action:
Make sure there is water present in the unit before firing.
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F3
Reason
Cause:
Bad wiring/connection in the return sensor circuit.
Corrective action:
Check for loose wiring/connections in the return sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace return sensor.
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F5
Reason
Cause:
It is not proven that the non-return of the burner that is not burning is closed.
Corrective action:
Check the state of the Non Return Valve:
> Is the valve moving freely to the open and closed position.
> Is there debris/fouling or corrosion in the valve to prevent the valve to move freely.
Check for loose wiring/connections in the circuit to the proximity switch of the NRV
Check the parameter settings of the burner controller
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Maximum return temperature exceeds limit value.
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No temperature rise measured during firing.
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Return sensor is not detected by the water heater PCB.
N
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NR valve contact (signal) lost for fixed time period.
(If P2MT = 2 or 3)
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