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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Electric – continued
A-6 Circuit Servicing
Testing A-6 - two element, two thermostat, one high limit, two wire circuit type water
heaters.
Wired non-simultaneously – When the upper element satisfies, power switches to the
lower thermostat and element.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
42
Element
Element Test
OHMS Resistance Check**
Test Conditions:
This test uses the multimeter's battery as the electrical
supply.
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.