STIEBEL ELTRON DHX 15 Select, Operation And Installation Instruction

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INSTALLATION
Troubleshooting
EN
GL
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www.stiebel-eltron-usa.com DHX 15 Select | 17
16. 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 an error
Yellow Lights up in heating mode/flashes when capacity 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/aerators if necessary
The filter screen in the cold water inlet is dirty Clean the filter screen
The flow sensor is not plugged in Connect the cable to the PCB
The flow sensor is faulty Replace the flow sensor
The PCB is faulty Replace the PCB
Green flashing, yellow
on, red off The display on the heater
is off There is a loose cable between the PCB and the
display unit Check the cable and plug the cable into the display and/
or PCB
The display cable is faulty Check the cable and replace if necessary
The display unit is faulty Replace the display, only available with a new heater
cover
The PCB is faulty Replace the PCB
Green flashing, yellow
on, red off The outlet temperature does
not match the set value The display 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 tap is faulty Replace the tap
The heating system is faulty Replace the heating system
The PCB is faulty Replace the PCB
Green flashing, yellow
flashing, red off The outlet temperature does
not match the set value Motorized valve limit reached Reduce the set temperature
Motorized valve is faulty Replace the motorized valve
Green flashing, yellow
off, red on No DHW Air detected Continue draw-off for >1 minute
Diagnostic lights Display readout Problem Cause Solution
Green flashing, yellow
off, red on Wrench flashes (displays
E1 and wrench in menu
“Fault code display”) No DHW AE3 safety switch not activated during
commissioning Activate AE3 safety switch by pressing the reset button
firmly. See section 12.2.1, “Initial AE3 safety switch acti-
vation,” pg. 14
AE3 safety switch triggered by
self-resetting high limit safety cut-out
Klixon Check high limit safety cut-out, Klixon (plug-in connec-
tion, connecting cable); activate AE3 safety switch
AE3 safety switch responds again after
high limit safety cut-out Klixon has been
checked; high limit safety cut-out faulty Replace high limit safety cut-out Klixon activate AE3 safe-
ty switch and draw off water at the maximum set value
for >1 min
Safety switch responds again; PCB faulty Replace the PCB
Wrench flashes (displays
E2 and wrench in menu
“Fault code display”) No DHW PCB faulty (lead break or short circuit in
inlet sensor) Replace the PCB
Wrench flashes (displays
E3 and wrench in menu
“Fault code display”) No DHW Short circuit in outlet sensor Check the outlet sensor, replace if necessary