DEX & DBX Installation, Maintenance and User Instructions V1.05 Page 16 August / 2014
Fault nding
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 6 005 005 or O345 6 005 005.
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.
Problem Cause Solution
Water stays cold (DEX / DBX)
Digital display does not light
up (DEX)
Circuit breaker tripped Reset circuit breaker
STDB tripped (DEX)
Contact Zip Service to
reset STDB (DEX)
message ‘Er’ (DEX)
Control system has
switched off
Switch power supply
off and on. If ‘Er’ still
Service
(DEX / DBX)
Clean shower head or
tap nozzle
Line strainer dirty or
Contact Zip Service to
Selected temperature not
achieved (DEX / DBX)
rate at the outlet
Selected temperature not
achieved and decimal point
Cold water has been
added at the outlet
Set for required
temperature and tap
hot water only
Inlet temperature
exceeding set point
Reduce inlet
temperature
Delivered temperature
perceived to be too cold
(DBX)
Set temperature too low
Contact Zip Service to
increase set
temperature
Delivered temperature
perceived to be too hot (DBX)
Set temperature too high
Contact Zip Service to
reduce set temperature
No response to keypress
(DEX)
correctly
correctly
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