Santon Premier Plus 150 - Fault Finding and Servicing Guide; Important Servicing Prerequisites; Troubleshooting Common Faults; Warning on Tampering with Controls

FAULT FINDING & SERVICING
IMPORTANT
• After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist located on pages 26
and 27 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 SystemFit 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 SystemFit cylinder range (see Table 5, page 23). 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 nding chart (above) will enable operational faults to be identied and their possible causes rectied. Any work
carried out on the PremierPlus SystemFit 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 SYSTEMFIT
CYLINDER AS THIS WILL INVALIDATE ANY GUARANTEE.
22
Table 4 - Fault Finding Table
FAULT POSSIBLE CAUSE REMEDY
No hot water ow
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 tted.
3. Check and ret as required.
Water from hot
taps is cold
1. BACK UP immersion heater not
switched on.
1. Check and switch on.
2. BACK UP 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 motorised 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 3.5 bar.
1. See Maintance section for re-charging
procedure (p.19).
2. CONTINUALLY
a. Cold water combination valve pressure
reducer not working correctly.
b. Expansion valve seat damaged.
2a. Check pressure from cold water combination
valve. If greater than 3.6 bar, replace pressure
reducer cartridge.
2b. Remove expansion valve cartridge. Check
condition of seat. If necessary, t 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 owing. The milkiness
will disappear after a short while.