Troubleshooting; Fault Finding - Heatrae Sadia PremierPlus Installation And User Manual

10. Troubleshooting

WARNING
Do not tamper with any of the safety valves
or controls supplied with the cylinder as this
will invalidate any guarantee.

10.1 Fault finding

Important
` After servicing, complete the relevant Service
Interval Record section of the Benchmark Checklist
located on pages 25 and 26 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 parts.
` Disconnect the electrical supply before removing
any electrical equipment covers.
` NEVER bypass any thermal controls or operate
system without the necessary safety valves.
Fault
No hot water flow
Water from hot tap
is cold
Water discharges
from expansion
valve
Water discharges
from T&P relief
valve
Milky water
Table 6: Fault finding chart
22
Possible Cause
Mains water supply off
Strainer blocked
Cold water combination valve incorrectly
fitted
Direct immersion heater not switched on
Direct immersion heater thermal cut-out
has operated
Indirect programmer set to central
heating only
Indirect boiler not working
Indirect thermal cut-out has operated
Indirect motorised valve not connected
correctly
Intermittently
Expansion vessel charge pressure has
reduced below 3.5bar, or set to high
Continually
Cold water combination valve pressure
reducer not working correctly.
Expansion valve seat damaged
Thermal control failure
CAUTION: Water will be very hot!
Oxygenated water
` Water contained in the cylinder may be very hot,
especially following a thermal control failure.
Caution must be taken when drawing water from
the unit.
The fault finding chart (table 6, below) will enable
operational faults to be identified and their possible
causes rectified. Any work carried out on the 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
support.
Spare Parts
A full range of spare parts are available for the
cylinder range (table 7, page 24). 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.
Remedy
Check and open stop cock
Turn off water supply. Remove strainer and clean
Check and refit as required
Check and switch on
Check, reset by pushing button on thermostat
Check, set to domestic hot water programme
Check boiler operation. If fault is suspected
consult boiler manufacturer's instructions
Check, reset by pushing button on thermostat.
Check operation of indirect thermostat
Check wiring and/or plumbing connections to
motorised valve
See Maintenance section (p.22) for re-charging
of expansion vessel procedure
Check pressure from cold water combination
valve. If greater than 3.5bar replace pressure
reducing valve cartridge.
Remove expansion valve cartridge, check
condition of seat. If necessary fit new expansion
Switch off power to immersion heater(s) and shut
down boiler.
DO NOT turn off water supply. When discharge
stops check all thermal controls, replace if faulty
Water from a pressurised system releases
oxygen bubbles when flowing. The milkiness will
disappear after a short while
service
valve