Service manual

TM014 Rheem Heavy Duty Electric Service Instructions REV: A
Date of Issue: 10/7/2002
12
FAULT FINDING
With multi-element water heaters very often more than one fault may have occurred before the user feels the
effect. When servicing a multi-element water heater each thermostat - element combination should be
checked to ensure correct operation. In manifolded installations a complaint for insufficient hot water may be
due to faults in more than 1 heater or may be a result of poor manifolding.
2
Insufficient Hot Water
Are
the thermostat
contacts
closed ?
Test 7
Is
the temperature
at the T&PR valve at
least 6 degrees lower than
the thermostat
setting?
NO
Slide the thermostat out from under the
retaining clamp and allow base to cool
NO
YES
Replace thermostat
YES
Did
the thermostat
contacts
close?
Test 7
Replace thermostatNO
Does
the element
have the correct
resistance?
YES
Are
the thermostat
ECO contacts
closed ?
Test 6
Install the element
correctly and reset the
ECO
YES
Test 8
Replace element
NO
Water heater
electrically ok.
Refer to manifolding
section
Is
the element
installed in the correct
orientation?
NO NO
Replace thermostatYES
Note: Depending on the stratification some
thermostats may be open and some closed.
Ensure the next step is followed to correctly
diagnose a faulty thermostat.
Is
more than
1 water heater
installed?
NO
YES
2
Repeat diagnoses
for each water heater
Repeat diagnoses for each
thermostat element
combination
YES