17
CEX-O & CEX-U Installation, Maintenance and User Instructions - August 2011
Problem
Cause
Solution
Water stays cold
Circuit breaker tripped
Reset circuit breaker
STDB tripped
Contact Zip Service to reset STDB
Display flashes error
Control system has
Switch power supply off and on.
message ‘Er’
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
Fine filter dirty or calcified
Contact Zip Service to clean fine filter
Selected temperature not
achieved, “MAX” lights up
Excessive water flow rate
Reduce water flow rate at the outlet
Selected temperature not
Cold water has been added
Set for required temperature and
achieved,“MAX” does not light
at the outlet
tap hot water only
Symbol “SUN” flashes
Inlet temperature exceeding
Reduce inlet temperature
set point
Water heats but display fails
Display lead plug not properly
Contact Zip Service to connect
to operate
connected
display lead correctly
Cleaning and maintenance
N.B. Maintenance work must only be carried out by a competent person familiar with
instantaneous water heaters.
Plastic surfaces and sanitary fittings should only be wiped with a damp cloth. Never
use abrasive cleaning agents or solvents.
Outlet fittings (tap nozzles and shower heads) should be unscrewed and cleaned at
regular intervals.
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 vented 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.
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.
CEX pages qxd:Varipoint qxd 30/8/11 14:27 Page 16