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22.0 FAULT CODES, BLOCKING CODES
22.1
IMPORTANT:
To avoid electric shocks, disconnect electrical supply before performing troubleshooting. To avoid burns,
allow the unit to cool before performing troubleshooting.
Be aware that a fault code is an indication that the unit or the system needs attention. When repeatedly
having faults these should not be neglected.
The first step is to check if the unit is installed according to the instructions. If not, first make sure the
installation complies with the installation manual.
Always check the fuses on the control board before replacing any major components. A blown fuse can
prevent the controller or other components from operating.
Most faults can also be caused by a bad wiring and/or connections, even if it is not specifically mentioned.
With every fault it is wise to check wiring and connections (at both ends) that connect to the safety
device/component that generates the fault.
22.1.1
LOCK-OUT CODES:
Having a lockout means that the water heater needs a manual reset to start operating again.
When the water heater is in lockout the backlight of the display is blinking on and off.
Explanation > 9
Explanation > P
Display message
F0
Reason:
Cause:
Bad wiring/connection in the flow sensor circuit.
Corrective action:
Check for loose wiring/connections in the flow sensor circuit.
Cause:
Bad temperature sensor causing a fault signal.
Corrective action:
Replace flow sensor.
Display message
F1
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 flow through the unit.
Check if the system resistance exceeds the spare capacity of the unit pump.
FAULT CODES
9
9
,
5
:
u m p
1
F
l
o w
s
p
u m p
o
Flow sensor is not detected.
F
l
o w
h
p
u m p
o
Max. flow temperature exceeds limitation (lock-out) value.
= time elapsed after fault/message.
h
r
s
= status of the pump during fault.
o
n
e
n
s
o
r
e
n
9
9
i
g
h
T
e m p
n
9
9
r
r
o
r
9
,
5
h
r
s
9
,
5
h
r
s
100
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