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20
Maintenance and repair
Tronic 1000 T – 6 720 821 421 (2017/10)
9.2.4 Continuous discharge from ECV & PTR valves
Discharges of more than 15 litres of water in 24 hours indicates
that the valve may not be functioning correctly. This may be
remedied by gently easing the valve lever for a few seconds as
described under Routine Service to dislodge any foreign
matter.
9.3 Service contact details
Bosch has an extensive network of service agents that may be
contacted in event of failure of your water heater.
Please contact AU 1300 30 70 37, NZ 0800 543 352, or Email
Ensure that you have copied the Model Number and Date of
Manufacture from the water heater Data label and pass this
information to our service department to ensure prompt
service.
10 Maintenance and repair
10.1 Periodic Inspection
It is recommended that a periodic inspection of the valves,
thermostat, heating elements and wiring should be made by a
service person qualified in electric appliance repair.
Most electrical appliances, even when new, make some sound
when in operation. If the hissing or singing sound level
increases excessively, the electric heating element may require
cleaning. Contact a qualified installer or service agent.
10.2 Pressure and temperature relief valve (PTR
Valve)
At least every 6 months:
▶ Lift and release the lever handle on the PTR valve, to make
certain the valve operates freely.
Allow several litres to flush through the discharge line to an
open drain.
If the valve does not discharge water when the release lever is
opened, or does not seal properly when closed, replacement
by an authorised person must be arranged immediately. The
PTR valve is not serviceable.
10.2.1 Vacation and Extended Shutdown
If the water heater is to remain idle for an extended period of
time, the power and water to the appliance should be isolated
to conserve energy and prevent the build up of dangerous
hydrogen gas.
The electric water heater and piping should be drained if they
might be subjected to freezing temperatures. After a long
shutdown period, the water heater’s operation and controls
should be checked by qualified service person.
Make certain the electric water heater is completely filled again
before operating.
10.3 Flushing the water heater
CAUTION: Continual flow may also indicate
high water pressure which will require a
pressure limiting valve to be fitted by an
authorised person.
WARNING:
The electric storage water heater should
only be serviced by a qualified person, and in
accordance with the Plumbing Standard AS/
NZS 3500.4 and local authority
requirements.
Routine service will assist in prolonging the
life of your water heater, and help ensure
trouble free operation.
DANGER:
Never replace the PTR Valve with one which
has a higher pressure rating than is specified
for your water heater.
DANGER:
Before manually operating the relief valve,
make certain no one will be exposed to the
hot water released by the valve. The water
drained from the tank may be hot enough to
present a scald hazard and should be
directed to a suitable drain to prevent injury
or damage.
WARNING:
Draining and flushing the water heater must
only be carried out by an authorised service
person.
A regular 5 years service plan by an
authorised person would include: draining
flushing, and refilling the water heater
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