A.O. Smith TC-049-R2 manual A-6 Circuit Servicing, Service Handbook, If …, … then

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.

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	Element
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	continue testing.
present
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	35	Training Department
©2002		Ashland City, Tennessee