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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Electric – continued
SERVICE
Testing C-2 type – single element, single controls type circuit
Element Test
OHMS Resistance Check**
Test Conditions:
This test uses the multimeter's battery as the electrical supply.
Element
Procedures:
Power to the water heater is "OFF".
Multimeter set to OHMS scale testing.
Black lead "Common" port.
Red lead in "Ω" or " OHMS" port.
Dial indicator set to scale above expected indication.
Note: Volts divided by amps = OHMS
Disconnect wires from the element terminals.
Test probe on each terminal of an element
See OHMS Resistance Table – Page 45
If … … then
proper resistance (+7.5%) is present continue testing.
meter reads "0"
check OHM scale setting.
replace element
meter reads "1" or off scale replace element.
** The above test can also be conducted with the element removed from the tank.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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