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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Electric – continued
A-7 service – Voltage Checks “Lack of Hot Water” – continued
Test Condition
Lower tank water is at least 15F below lower thermostat setting
Test between lower high limit 4 and lower thermostat 2 or lower high limit L4 and
lower thermostat T2
If … … then
proper voltage is not present: check jumper between lower high limit
2 and lower thermostat 1.
replace lower thermostat.
proper voltage is present: continue to next step.
Test between the terminals of the lower element
If … … then
proper voltage is not present: check wire connections to lower controls.
proper voltage is present: conduct grounded element checks.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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