Ohms Check - A.O. Smith TC-049R3 Service Handbook

RESIDENTIAL GAS AND ELECTRIC WATER HEATER
Residential Electric – continued
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.
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 ...
proper resistance (+7.5%) is present
meter reads "0"
meter reads "1" or off scale
** The above test can also be conducted with the element removed from the tank.
A.O. Smith Water Products Company
©2005
SERVICE HANDBOOK
SERVICE
... then
continue testing.
•
check OHM scale setting.
•
replace element
replace element.
38
Element
Technical Training Department
Ashland City, TN