INSTALLATION
Troubleshooting
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14. Troubleshooting
WARNING Electrocution
Never remove or reinstall the water heater’s cover
unless the electricity servicing the unit is turned off.
Failure to do so could result in personal injury or death.
WARNING Electrocution
To test the water heater using the internal diagnostic
lights, it must be connected to the power supply.
When testing with the cover off, never touch any part
of the water heater. Doing so could result in serious
personal injury or death.
Note
When testing the water heater using the diagnostic lights,
water must be flowing through the unit.
Diagnostic lights
Red Lights up in the event of a fault
Yellow Lights up in heating mode/flashes when output limit
reached
Green Flashing: Water heater connected to power supply
Diagnostic lights Problem Cause Solution
No LED is lit The water heater does not
heat up
There is no power
Check to ensure the connected circuit breaker in
the main breaker panel hasn’t tripped. Reset if
necessary
The PCB is faulty Replace the PCB
Green flashing, yellow
off, red off
No DHW
The shower head/aerator is scaled up Descale or replace the shower head/aerator if nec-
essary
The filter screen in the cold water inlet is dirty Clean the filter screen. See section 15.2, “Cleaning
the filter screen”, pg. 16
The flow meter is not plugged in Connect the cable to the PCB
The flow meter is faulty Replace the flow meter
The PCB is faulty Replace the PCB
Green flashing, yellow
on, red off
The outlet temperature does
not match the set value
The programming unit was not plugged in before
power was switched on
Perform a reset by switching off the power to the
water heater
The outlet sensor is faulty Replace the outlet sensor
The heating system is faulty Replace the PCB
The PCB is faulty Replace the PCB
Green flashing, yellow
off, red on
No DHW
Air detected Continue draw-off for >1 minute
AE3 safety switch not activated during commission-
ing
Activate AE3 safety switch by pressing the reset
button firmly. See section 10.3.1, “Initial AE3 safety
switch activation”, pg. 11
AE3 safety switch triggered by high limit safety
cut-out
Check high limit safety cut-out (plug-in connection,
connecting cable); activate AE3 safety switch
AE3 safety switch responds again after high limit
safety cut-out has been checked; high limit safety
cut-out faulty
Replace high limit safety cut-out; activate AE3 safety
switch and draw off water at the maximum set value
for >1 min
Safety switch responds again; PCB faulty Replace the PCB
PCB faulty (lead break or short circuit in inlet sen-
sor)
Replace the PCB
Short circuit in outlet sensor Check the outlet sensor, replace if necessary
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