TM012 Rheem Electric Water Heaters Service Instructions REV: B
Date of Issue: 03/06
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23
Fault Finding Chart 5
2
Noisy Water Heater
Is the
water pressure
more than 80% of
the T&PR valve
rating?
YES
YES
Check for:
(A) Mineral build up on the element
(B) Mineral or sludge build up in the
cylinder
(C) Normal noises associated with
heating water
Is the
noise only
evident when water
is flowing through
the water
heater
Is
the noise water
hammer?
Is
the noise
a metallic popping
sound?
Is
the noise
only evident during
the heating
cycle?
Check for restrictions in pipe work,
faulty valves, loose plumbing or other
appliances i.e washing machine or
dishwasher.
Fit 600kPa PLV if pressure excessive
NO
YES
Check for faulty stop cock, non-return
valve or T&PR valve
NO
YES
NO
Cylinder contracting due to pressure
release when hot tap opened. This
can also be accompanied by a
creaking or cracking sound from the
insulation. This noise is normal
operation
YES
YES
NO
Check all other appliances that can
generate noise i.e. washing machine,
dishwasher, ball cocks etc.
Refer to water hammer causes on
page 9, common faults
YES
NO
