TM074: Stainless Steel Electric Water Heater Service Instructions
REV AB Issued: 07/16
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16
Fault Finding Chart 1.2
Single element model
1.2
Are the thermostat
ECO contacts
closed? (TEST 2)
NO
YES
Is the element
installed in the correct
orientation?
NO
YES
Install element in correct
orientation and reset ECO.
Replace thermostat.
Are the thermostat
contacts closed?
(TEST 3)
Is cylinder water temp
12ºC less than the
thermostat setting?
NO
YES
Slide thermostat out from
retaining bracket and allow
thermostat base to cool
NO
Did the thermostat
contacts close?
(TEST 3)
NO
Does the element
have the correct
resistance? (TEST 4)
YES
Replace element.
NO
Is the overall
resistance of the
water heater correct?
(TEST 5)
YES
Locate wiring failure and repair.
NO
Water heater electrically ok.
YES
YES
Fault Finding Chart 1.3
Twin element model
1.3
Are the top
thermostat ECO
contacts closed?
(TEST 6)
NO
YES
Is the top element
installed in the correct
orientation?
NO
YES
Install top element in correct
orientation and reset ECO.
Replace top thermostat.
Is the top thermostats
neutral contact to the
top element closed?
(TEST 7)
NO
YES
NO
YES
Does the top element
have the correct
resistance? (TEST 4)
YES
Replace top element.
NO
Is the overall
resistance of the
water heater correct?
(TEST 5)
YES
Locate wiring failure and repair.
NO
Water heater electrically ok.
YES
Is the bottom element
installed in the correct
orientation?
Replace top thermostat.
YES
Install bottom element in correct
orientation and reset ECO.
NO
1.4
NO
Is cylinder water temp
48ºC or less?
Is the top thermostats
neutral contact to the
bottom element
closed? (TEST 8)