TM039 Rheem Water Star Service Instructions REV: A
Date of Issue: 02/09
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14
Fault Finding Chart 2
2
High energy bill/ Insufficient hot water
NO
Refer to Rheem sizing guide
Recommend a water heater
of sufficient capacity to meet
the customer‟s needs.
Fit pressure limiting valve
(PLV), if not already installed.
Replace faulty PLV. Replace
faulty T&PR valve.
Recommend a hot water
usage pattern that will suit
the water heater and the
customer‟s needs.
Check for cross water
connection. Replace the
T&PR valve (if required.).
Repair any leaks. Isolate
cross connections.
Replace the thermostat
Is the heater of
sufficient size for the
customer‟s ongoing
needs?
Has the usage
pattern changed
recently, ie.additional
appliances or people
using hot water?
Is the T&PR
valve continuously
discharging
water?
Does the cylinder
water temperature
correspond with the
thermostat setting?
Are there any plumbing
leaks,
crossed connections
or dripping taps?
Is the correct T&PR valve
fitted?
Is the water supply
pressure more than 80%
of the T&PR
valve rating?
YES
NO
YES
NO
NO
NO
NO
YES
YES
Is a tempering valve
installed?
NO
YES
YES
YES
Replace T&PR valve with one
with the correct pressure
rating.
Do not use
reconditioned T&PR valves.
Measure the water temperature at the T&PR
valve drain by gently lifting the easing lever
Water Star OK. Possible fault
with continuous flow gas water
heater. (Refer to relevant
service instructions).
Has there been a recent
large draw off of hot
water
NO
NO
Allow heater time to recover
YES
Possible fault with tempering
valve
YES
AS/NZS 3500 Part 4 only requires
fixtures used for ablution purposes to
be tempered. If practical a 2-zone
plumbing solution may be offered.
Replace the transfer valve
Is the transfer valve
allowing water to pass in
both directions?
NO
YES
