16
FAULT FINDING & SERVICING
IMPORTANT
After servicing, complete the relevant Service
•
Interval Record section of the Benchmark
Checklist located on page 22 and 23 of this
document.
Servicing should only be carried out by
•
competent persons in the installation and
maintenance of unvented water heating
systems.
Any spare parts used
•
MUST
be authorised
Santon parts.
Disconnect the electrical supply before removing
•
any electrical equipment covers.
NEVER bypass any thermal controls or operate
•
system without the necessary safety valves.
Water contained in the PremierPlus cylinder
•
may be very hot, especially following a thermal
control failure. Caution must be taken when
drawing water from the unit.
SPARE PARTS
A full range of spare parts are available for the
PremierPlus cylinder range (See Table 5 Page 17).
Refer to the technical data label on the unit to identify
the model installed and ensure the correct part is
ordered. You will need to quote the serial number
which is printed on the data label.
FAULT FINDING
The fault finding chart (below) will enable operational
faults to be identified and their possible causes
rectified. Any work carried out on the PremierPlus
cylinder unvented water heater and its associated
controls
MUST
be carried out by a competent installer
for unvented water heating systems. In case of doubt
contact service support (see contact details on back
page).
WARNING
DO NOT TAMPER WITH ANY OF THE SAFETY
VALVES OR CONTROLS SUPPLIED WITH THE
PREMIERPLUS CYLINDER AS THIS WILL INVALIDATE
ANY GUARANTEE.
FAULT
POSSIBLE CAUSE
REMEDY
No hot water flow
1. Mains supply off.
2. Check and open stock cock.
2. Strainer blocked.
2. Turn off water supply. Remove strainer and
clean (see maintanance section).
3. Cold Water Combination Valve
incorrectly fitted.
3. Check and refit as required.
Water from hot
taps is cold
1. DIRECT immersion heater not
switched on.
1. Check and switch on.
2. DIRECT immersion heater thermal
cut-out has operated.
2. Check. Reset by pushing button.
3. INDIRECT programmer set to Central
Heating only.
3. Check. Set to Domestic Hot Water
programme.
4. INDIRECT boiler not working.
4. Check boiler operation. If fault is suspected
consult boiler manufacturers instructions.
5. INDIRECT thermal cut-out has
operated.
5. Check. Reset by pushing button on cut-out.
Check operation of indirect thermostat.
6. INDIRECT moterised valve not
connected correctly.
6. Check wiring and/or plumbing connections
to motorised valve.
Water discharges
from Expansion
Valve
1. INTERMITTENTLY
Expansion Vessel charge pressure has
reduced below 3.5bar
1. See Maintance section for re-changing
procedure.
2. CONTINUALLY
a. Cold Water Combination Valve
Pressure reducer not wor king
correctly.
b. Expansion Valve seat damaged.
2a. Check pressure from Cold Water Combination
Valve. If greater than 3.6bar replace Pressure
Reducer cartridge.
2b. Remove Expansion Valve Cartridge. Check
condition of seat. If necessary fit new Expansion
Valve cartridge.
Water discharges
from T&P Relief
Valve
1. Thermal control failure. NOTE water
will be very hot.
1. Switch off power to immersion heater(s) and
/or shut down boiler. DO NOT turn off water
supply. When discharge stops check all thermal
controls, replace if faulty.
Milky water
1. Oxygenated water.
1. Water from a pressurised system releases
oxygen bubbles when flowing. The milkiness
will disappear after a short while.
Table. 4: Fault finding chart