16 DEX & DBX Installation, Maintenance and User Instructions - April 2011
Problem Cause Solution
Water stays cold (DEX / DBX) Circuit breaker tripped Reset circuit breaker
Digital display does not light
STDB tripped (DEX)
Contact Zip Service to reset
up (DEX) STDB (DEX)
Display flashes error message Control system has Switch power supply off and on.
‘Er’ (DEX) switched off If ‘Er’ still flashes contact Zip Service
Poor hot water flow rate
Outlet fitting dirty or calcified Clean shower head or tap nozzle
(DEX / DBX)
Line strainer dirty or calcified Contact Zip Service to clean line filter
Selected temperature not
achieved (DEX / DBX) Excessive water flow rate Reduce water flow rate at the outlet
Decimal point flashes (DEX)
Selected temperature not
achieved and decimal point
Cold water has been added Set for required temperature
does not flash (DEX)
at the outlet and tap hot water only
Decimal point flashes (DEX)
Inlet temeperature exceeding
Reduce inlet temperature
set point
Delivered temperature Contact Zip Service to increase set
perceived to be too cold (DBX)
Set temperature too low
temperature
Delivered temperature Contact Zip Service to reduce set
perceived to be too hot (DBX)
Set temperature too high
temperature
No response to keypress Appliance cover not fitted
Refit appliance cover correctly
(DEX) correctly
Fault finding
Repairs should only be carried out by competent persons familiar with
electric instantaneous water heaters.
All service work should be performed by an authorized Zip service engineer – for
details of the full range of services available call Zip Service on 0845 602 4533.
When calling for service, please always specify the appliance model and serial
number.
The following table will be helpful in determining the causes of some common
problems and their solutions.
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