SAVE A SERVICE CALL
24
WATER NOT HOT ENOUGH
You may find that due to heavy hot water usage the water temperature may be
lower than normally expected.
TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE
RUNNING
• Normal Operation
It is normal and desirable the
temperature pressure relief valve or
expansion control valve (if fitted) allows
a quantity of water to escape during the
heating cycle. This quantity should be
equal to approximately 1/50 of the hot
water used, as water expands by this
volume when heated. However, if it
discharges more than a bucket full of
water in 24 hours, there may be another
problem.
The expansion control valve will
discharge water instead of the
temperature pressure relief valve as it
has a lower pressure rating. A benefit is
that energy is conserved as the
discharged water is cooler. This valve is
installed in the cold water line to the
water heater (refer to the cold water
connection diagram on page 36).
• Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
to “Relief Valves” on page 10). This may dislodge a small particle of foreign
matter and clear the fault. Release the lever gently.
• Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises above the
designed pressure of the water heater. Ask your installing plumber to fit a
pressure limiting valve.
Warning: Never replace the relief valve with one of a higher pressure
rating.
• Heavy flows of hot water from the temperature pressure relief valve until
the water heater is cold - then stops until water reheats
The gas control must be turned off using the knob on top of the gas control
thermostat (refer to “Close Down Procedure” on page 45). Phone Rheem
Service or nearest Accredited Service Agent / Centre to arrange for
inspection.
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