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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
44
Residential Electric – continued
A-6 service Voltage Check “No Hot Water” – continued
Test between Thermostat 2 and High Limit 4 or T2 and L4
If … … then
supply voltage is present: continue.
supply voltage is not present check jumper between high limit 2 and
thermostat 1.
replace thermostat – (tank must be 15F
cooler than setting to activate thermostat.
Complaint: Lack of Hot Water
Conditions:
Upper thermostat satisfied
Lower portion of tank still calling for heat
Test between high limit 4 and thermostat 4 and L4 and T4
If … … then
correct supply voltage is present continue.
correct supply voltage is not present check that tank water temp has satisfied
the upper thermostat.
replace the upper thermostat.
Test between high limit 4 and lower thermostat 1 or L4 and 1
If … … then
correct supply voltage is present continue.
correct supply voltage is not present check wiring connections.
Test between high limit 4 and lower thermostat 2 or L4 and 2
If … … then
correct supply voltage is present continue.
correct supply voltage is not present replace lower thermostat.