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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Electric – continued
C-2 – service continued
Complaint: No Hot Water
Conditions:
Tank water cold
Power on
Procedure:
Multimeter set for
AC voltage check
Voltage Checks
Test voltage between 1 and 3 or L1 and L3 of high limit.
If … … then
rated voltage is not present check circuit breaker (fused disconnect)
check wire connections in heater junction
box
check position of heater ON/OFF switch-if
applicable.
rated voltage is present continue to next step.
Test voltage between 2 and 4 or L1 and L4 of high limit
If …
… then
rated voltage is not present press high limit reset button
replace high limit (after conducting
thermostat check)
rated voltage is present continue to next step.
Test voltage between 4 and 2 or T2 and L4
If …
… then
rated voltage is not present check jumper between high limit 2 and
thermostat 1or
on T2, L4 test-replace control.
rated voltage is present continue to next step.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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