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10. Troubleshooting
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.
Fault
Water not heating
Discharge of water from
Expansion (pressure) relief
valve
(continuously).
Discharge of water from
Expansion (pressure) relief
valve
(intermittently).
Discharge of water from
temperature/pressure relief
valve and/or water/steam from
pressure relief valve
No water flow
"Milky water"
Table 8: Fault finding chart
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.
Possible cause
Electrical supply fault.
Thermal cut out tripped.
Thermostat setting too low or
faulty.
Element Failure.
Excessive mains water
pressure.
Expansion (pressure) relief
valve fault.
Loss of pressure from expansion
vessel.
Thermostat and thermal cut out
fault.
Product incorrectly installed.
Mains water supply not turned
on.
Blockage in mains water supply.
Oxygenated water
10.1 Fault finding
Important
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).
Check electrical supply.
Check cut out. If operated then reset. Check
thermostat & replace if necessary.
Check and adjust setting if required. Replace if
Check pressure from Pressure reducing valve.
Replace if greater than 0.35MPa (3.5bar / 51psi)
Replace Expansion (pressure) relief valve.
Check and if necessary recharge expansion
vessel precharge pressure.
Replace combined thermostat & thermal cut out.
Check inlet & outlet connections are correct.
Check valves are installed in accordance with
flow direction marks.
Check mains water supply is turned on.
Check mains water supply for obstructions.
Check strainer in pressure reducing valve.
Water from a pressurised system releases
oxygen bubbles when flowing. The milkiness will
disappear after a short while.
Remedy
necessary.
Replace EPA.
19
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