TM012 Rheem Electric Water Heaters Service Instructions REV: B
Date of Issue: 03/06
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16
Fault Finding Chart 2
Warning: Terminals may be live,
Personal Protective Equipment
should be worn.
2
No hot water - Twin element models
Is
240 volts
present at the terminal
block supplying the
upper and lower
elements?
Restore power and
advise customer
Using the procedure on page 25
conduct an electrical insulation test
Is
either element
circuit connected to
an off peak
tariff?
Possible failure of the off peak relay or missed
signal from energy supplier. Continue with diagnosis
to confirm water heater is operational.
YES
Is the
isolating switch
turned
off?
NO
NO
Is the
fuse(s) blown
at the switch
board?
Is the
reading below 1
mega-ohm?
7
YES
NO
YES
YES
Possible fault in household
electrical wiring, continue with
diagnosis to confirm water
heater is operational
NO
Isolate power and continue
with diagnosis procedure
NO
2.1
Test 2, 3 and 4
Test 9
Complaint may also be due to the booster circuit not
being available continuously (insufficient hot water)
3
YES
