RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
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)
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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