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Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX
Technical support
Tel: 0345 6 005 005 email: service@zipindustries.co.uk www.zipwater.co.uk
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 on 0345 6 005 005.
• When calling for service, please always specify the appliance model and serial number.
This instantaneous water heater was manufactured, thoroughly inspected & tested before delivery. Use the
following fault finding information to diagnose the fault or seek remedial action.
Problem Cause Solution
Water stays cold (DBX/DEX)
Digital display does not light up
(DEX)
Circuit breaker tripped Reset circuit breaker
Safety pressure cut-out
tripped
Contact Zip Service to reset SDB
Safety thermal cut-out
tripped (DBX)
Contact Zip Service to reset STB
Water stays cold, digital display
does light up (DEX)
Safety thermal cut-out
tripped
Contact Zip Service to reset STB
Display flashes error message “Er“
(DEX)
Control system has
switched off
Switch power supply off and on. If “Er” still
flashes contact Zip Service
Poor hot water flow rate (DBX/DEX)
Outlet fitting dirty or
calcified
Clean shower head, jet regulator or sieves
Fine filter dirty or calcified Contact Zip Service to clean fine filter
Selected temperature not achieved,
(DBX/DEX)
Decimal point lights up (DEX)
Water flow rate too high Reduce water flow rate at the tap
Selected temp. not achieved,
decimal point does not light (DEX)
Cold water has been
added via the tap
Tap hot water only; set temperature for use
Decimal point flashes (DEX)
Inlet temperature
exceeding set point
Reduce inlet temperature
Selected temperature is perceived
to be too cold (DBX)
Set temperature too low
Contact Zip Service to increase set
temperature
Selected temperature is perceived
to be too hot (DBX)
Set temperature too high
Contact Zip Service to reduce set
temperature
No response upon keypress (DEX) Hood is not fitted properly Re-fit appliance cover correctly
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