RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company
Training Department
©
2002
Ashland City, Tennessee
36
Residential Electric – continued
A-6 service – continued
Testing with the Multimeter
Probes installed to test for "voltage - (black test lead is “common".)
Dial set to AC - Voltage scale - set dial to highest voltage scale or scale above the
expected voltage. Do not set the meter to a scale below the voltage expected.
Complaint: No
hot
water
Test Conditions:
Tank is full of cold water.
Power is "on" to the heater
Voltage Check
Test between 1 and 3 or L1 and L3
If …
… then
correct supply voltage is present
continue.
correct supply voltage is NOT present
•
check disconnect breaker.
•
check wiring to the heater.
Test between 2 and 4 or L1 and L4
If …
… then
correct supply voltage is present
continue
correct supply voltage is NOT present,
push Manual Reset - if power is now supplied,
conduct thermostat and element checks.
still no power
replace High Limit (High Limit/Thermostat on
89T)
