A.O. Smith TC-049R3 Service Handbook page 50

RESIDENTIAL GAS AND ELECTRIC WATER HEATER
Residential Electric – continued
A-7 Voltage Check - continued
Complaint:
Test Conditions:
Upper thermostat satisfied
Test between upper high limit 4 and upper thermostat 4
If ...
proper voltage is not present
proper voltage is present
Test between lower high limit terminal 1 and 3 or L1 and L3
If ...
proper voltage is not present
proper voltage is present
Test between lower high limit 2 and 4 or L1 and L4
If ...
proper voltage is not present
pushing reset restored voltage
pushing reset did not restore voltage
proper voltage is present
A.O. Smith Water Products Company
©2005
SERVICE HANDBOOK
Lack of Hot Water
... then
replace upper thermostat.
continue to next step.
... then
check wiring to upper thermostat and
•
heater junction box.
check that off peak meter is not
•
"Open".
continue to next step.
49
... then
push lower high limit reset.
conduct lower thermostat check
•
conduct lower element checks
•
replace lower high limit
continue to next step
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