Heatrae Sadia 7037042, Installation, Operation And Maintenance Manual

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10. Troubleshooting
10.1 Fault finding
Important
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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.The
Fault Finding Chart (table 8, below) will enable
operational faults to be identified and their possible
causes rectified. Any work carried out on the
unvented appliance 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
page 28).
WARNING
DO NOT tamper with any of the safety
valves or controls supplied with the water
heater as this will invalidate any warranty.
Water contained in the water heater may
be very hot, especially following a thermal
control failure. Caution must be taken when
drawing water from the water heater.
Table 8: Fault finding chart
Fault Possible cause Remedy
Water not heating Electrical supply fault. Check electrical supply.
Thermal cut out tripped. Check cut out. If operated then reset. Check
thermostat & replace if necessary.
Thermostat setting too low or
faulty.
Check and adjust setting if required. Replace if
necessary.
Element Failure. Replace EPA.
Discharge of water from
Expansion (pressure) relief
valve
(continuously).
Excessive mains water
pressure.
Check pressure from Pressure reducing valve.
Replace if greater than 0.35MPa (3.5bar / 51psi)
Expansion (pressure) relief
valve fault.
Replace Expansion (pressure) relief valve.
Discharge of water from
Expansion (pressure) relief
valve
(intermittently).
Loss of pressure from expansion
vessel.
Check and if necessary recharge expansion
vessel precharge pressure.
Discharge of water from
temperature/pressure relief
valve and/or water/steam from
pressure relief valve
Thermostat and thermal cut out
fault.
Replace combined thermostat & thermal cut out.
No water flow Product incorrectly installed. Check inlet & outlet connections are correct.
Check valves are installed in accordance with
flow direction marks.
Mains water supply not turned
on.
Check mains water supply is turned on.
Blockage in mains water supply. Check mains water supply for obstructions.
Check strainer in pressure reducing valve.
“Milky water” Oxygenated water Water from a pressurised system releases
oxygen bubbles when flowing. The milkiness will
disappear after a short while.
Spare Parts
A full range of spare parts are available for the
appliance range (table 9, page 23). Refer to the
technical data label on the appliance 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.