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F1
Reason:
Cause:
System 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.
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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.
Display message
F6
Reason
Cause:
Bad wiring/connection in the flue gas sensor circuit.
Corrective action:
Check for loose wiring/connections in the flue gas sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace flue gas sensor.
R e
t
u
r
n
p u m p
o n
Maximum return temperature exceeds limit value.
R e
t
u
r
n
p u m p
o n
Return sensor is not detected by the water heater PCB.
F
l
u e
s
e n s o
p u m p
o n
Flue sensor is not detected by the water heater PCB.
h
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T e m p
9
9
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9
9
9
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9
9
9
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5
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r
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,
5
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,
5
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99
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- Fault Code Display
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