CEX-O_CEX-U, Maintenance and User Instructions V1.02 Page 16 March / 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.
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
Circuit breaker tripped Reset circuit breaker
STDB tripped
Contact Zip Service to reset
STDB
Display ashes error message
‘ER’
Control system has switched off
Switch power supply off and on.
If ‘ER’ still ashes contact Zip
Service
Poor hot water ow rate
Outlet tting dirty or calcied Clean shower head or tap nozzle
Fine lter dirty or calcied
Contact Zip Service to clean ne
lter
Selected temperature not
achieved ‘MAX’ lights up
Excessive water ow rate
Reduce water ow rate at the
outlet
Selected temperature not
achieved ‘MAX’ does not light
Cold water has been added at
the outlet
Set for required
temperature and tap hot water
only
Symbol ‘SUN’ ashes
Inlet temperature exceeding set
point
Reduce inlet temperature
Water heats up but display fails
to operate
Display lead plug not properly
connected
Contact Zip Service to connect
display lead correctly
• If any parts are cracked or broken, replace them. If the washer has hardened, it should be
replaced.
• With the debris cleaned out, screw the regulator back into the tap.
Hand tightening should be adequate.
The electrical and plumbing components should be inspected regularly by a competent
person to ensure proper functioning and operational safety.
Water quality should be considered when determining the frequency of inspection.
Each time the appliance is emptied (e.g. due to work on the plumbing system, if there is a risk of
freezing or in case of maintenance), the appliance must be purged by opening and closing the hot
water tap until all air has been eliminated from the water heater and no more air emerges before
re-connecting to the electrical supply.
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