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© 2015 AKW
14-019-002-08
© 2015 AKW
13-012-085-13
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Troubleshooting for Engineers
Commissioning
In the event that the shower fails to respond to any push-button instruction or exhibits unusual
performance characteristics during operation, turn off the electrical supply by operating the
pull-cord switch or isolating switch. Wait for a few seconds for the shower to reset, then turn the
power back on and push the on/off button. If the problem still persists, note which fault LED is
lit/flashing, then refer to the Fault Finding section.
**
Outlet Thermistor Fault
**
Inlet Thermistor Fault
*
Low Flow/Low Pressure Fault
Note: Fault signals are assigned to these LED’s
Momentary over
temperature
***
No. 10 temperature
LED flashing (2Hz
rate)
Uncontrolled over
temperature
**
1-10
Temperature
LEDs flashing
*User resettable when external fault cleared
(On/Off pressed and released)
**Requires internal repair / reset
***Automatic reset when over temperature
condition cleared (naturally cooling down or by
fl ushing cold water through shower heater).
Overheating
The shower is fitted with an over-temperature indicator and a safety cut-out device. In the event of abnormal operation
which could cause unsafe temperatures within the unit, the device will disconnect the heating elements and switch off the
shower. The flow and the over temp LED will then flash.
If the water temperature rises above the desired maximum temperature setting momentarily then ***No. 10 temperature
LED will flash at a (2Hz rate). The shower will control the water temperature back to the desired level.
If the water temperature rise is uncontrolled the shower will turn off to prevent an unsafe temperature and the
**Temperature LEDs 1 to 10 will flash immediately. The shower will not turn back on until the water inside the unit has
cooled to a safe level. Perform a COLD FLUSH to cool the heating elements quicker, see page 28. If the fault persists the
a reset or internal repair may be required. Ensure all electrical connections are tight to prevent overheat.
Low Flow/Pressure Failure
The shower contains a ‘LOW FLOW/LOW PRESSURE’ indicator which will operate, if the following conditions occur:
• Low water pressure (below 0.5 bar maintained) for optimum performance a minimum constant 1 bar is recommended
• Blocked or partially blocked spray plate
• Blocked inlet filter
• Supply flow rate is below 2 litres per minute
If any of the above low pressure conditions occur, the unit will STOP as this will cause the shower to be over temperature
and the over temp LEDs will flash. Turn off the electrical supply by operating the pull-cord switch or isolating switch, then
turn the power back on and instead of waiting for the shower heater element/tank to cool down, perform a COLD FLUSH
see page 28. If the problem still persists then refer to Fault Finding. Ensure all plumbing connections are watertight.
Check the hose and shower handset. If the filter is suspected to be blocked, clean it. If the problem still persists, contact
AKW Technical Enquiries.
LP : Low Flow/Pressure
The shower contains a ‘LOW PRESSURE’ indicator which will operate, if the following conditions
occur:
• Low water pressure (below 0.5 bar maintained). For optimum performance, a minimum
constant 1 bar is recommended
• Blocked or partially blocked spray plate
• Blocked inlet filter
• Water supply flow rate is below 2 litres per minute
If any of the above low pressure conditions occur, the unit will STOP as this will cause the
shower to be over temperature and the over temp LEDs will flash. Turn off the electrical supply
by operating the pull-cord switch or isolating switch, then turn the power back on and instead
of waiting for the shower heater element/tank to cool down, perform a COLD FLUSH see page
28. If the problem still persists then refer to Fault Finding. Ensure all plumbing connections are
watertight. Check the hose and shower handset. If the filter is suspected to be blocked, clean it. If
the problem still persists, contact AKW Technical Enquiries.
E1 : Inlet Thermistor Fault
Requires internal repair/reset
E2 : Outlet Thermistor Fault
Requires internal repair/reset
E3 : Uncontrolled over Temperature
If the water temperature rise is uncontrolled the shower will turn off to prevent an unsafe
temperature and E3 LED will flash immediately. The shower will not turn back on until the water
inside the unit has cooled to a safe level. Perform a COLD FLUSH to cool the heating elements
quicker, see page 28. If the fault persists, then a reset or internal repair may be required.
Fault Display
